merge: lane/pkg-qa — GUI DoD gates wired, conformance required

pkg: wire GUI's DoD harness into CI, mark live-veloxd conformance required
gui-dod (per-PR: scroll-60fps + unhappy-path) and gui-dod-nightly (rss-flat, schedule/workflow_dispatch) are live in ci.yml, driving GUI's newly-landed gui/tests/dod/run.sh + gui-dod-harness. No Xvfb step: run.sh already runs QT_QPA_PLATFORM=offscreen itself. Each gate forced red once before being trusted (tests/integration/README.md has the transcripts): VELOX_DOD_FRAME_BUDGET_MS=0.01 for scroll-60fps, VELOX_DOD_RSS_SLACK_KIB=-999999999 for rss-flat, and — since run.sh always starts a working mockd — a direct gui-dod-harness invocation against an unreachable socket for unhappy-path, which hit the harness's own 75s watchdog exactly as documented. Recorded GUI's live finding (gui/docs/proto-requests-m1.md) that mockd --drop-connection is a no-op over the UDS transport, so unhappy-path's drop-connection phase can't yet exercise a real drop — coordinating with PROTO on the fix rather than working around it locally. gui-dod stays required regardless: its other two phases and the crash/hang/watchdog paths still catch real regressions. Added gui-dod to BRANCH_PROTECTION.md's required-checks table. ADR 0019: the live-veloxd conformance runner (run.sh step 3b, already unconditional inside the already-required conformance job) stays required as PROTO's xfail list shrinks (18 entries now, down from 34; 57/57 fixtures passing on main). No CI change needed — it was already inside a required check; this records the decision not to carve out an exception for it. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01RBPR7iM3YPyxrjWsVtZDPJ
2026-09-12 22:05:06 +04:00 · 2026-09-12 22:04:09 +04:00 · 2026-09-12 21:44:55 +04:00 · 2026-09-12 21:40:31 +04:00 · 2026-09-12 21:40:31 +04:00 · 2026-09-12 21:34:24 +04:00
43 changed files with 2996 additions and 152 deletions
@@ -18,8 +18,9 @@ policy so it can be re-applied or audited.
  | `bootstrap-script-2604` | now — real `--with-clang` install in a 26.04 container; the release the project ships on |
  | `build (gcc)` / `build (clang)` | now — core, daemon and gui have merged |
  | `sanitizers (dev)` / `sanitizers (tsan)` | now — core, daemon and gui have merged |
-  | `conformance` | **now — `tests/conformance/` has landed; this is the M0 exit gate** |
+  | `conformance` | **now — `tests/conformance/` has landed; this is the M0 exit gate.** Includes the live-`veloxd` runner (step 3b of `run.sh`), unconditional in the script — see `docs/adr/0019-live-veloxd-conformance-is-required.md`. |
  | `extension-lint` | now — `extension/` has merged (MV3 manifest + esbuild build) |
+  | `gui-dod` | now — `gui/tests/dod/` has landed (GUI M1 DoD gates R3: `scroll-60fps`, `unhappy-path`); see `tests/integration/README.md#gui-m1-definition-of-done-gates-r3`. `gui-dod-nightly` (`rss-flat`) is schedule-only and cannot be a required PR check. |

  `clang-tidy` is intentionally **not** required through M1 (`continue-on-error: true`,
  `.clang-tidy` has `WarningsAsErrors: ''`). Make it required at M2.
@@ -248,3 +248,56 @@ jobs:
        run: cmake --build --preset dev --target veloxd
      - name: Nightly integration run
        run: python3 tests/integration/nightly_run.py --veloxd build/dev/bin/veloxd --tasks 50 --timeout 180
+
+  gui-dod:
+    # Per-PR GUI M1 DoD gates (gui/docs/pkg-qa-requests-m1.md R3): scroll-60fps and
+    # unhappy-path. The 10-minute rss-flat gate is gui-dod-nightly, not here. GUI's
+    # harness defaults QT_QPA_PLATFORM=offscreen itself, so no Xvfb/compositor needed.
+    # See tests/integration/README.md#gui-m1-definition-of-done-gates-r3 for what each
+    # gate catches and the forced-failure transcript proving it isn't vacuous.
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Bootstrap toolchain
+        run: sudo ./tools/bootstrap.sh
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'          # tools/mockd
+      - name: Configure + build
+        run: |
+          cmake --preset dev
+          cmake --build --preset dev --target gui-dod-harness
+      - name: Install mockd
+        run: cd tools/mockd && npm ci
+      - name: Gates
+        run: |
+          gui/tests/dod/run.sh scroll-60fps  --json scroll.json
+          gui/tests/dod/run.sh unhappy-path  --json unhappy.json
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: gui-dod-${{ github.run_id }}
+          path: "*.json"
+
+  gui-dod-nightly:
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Bootstrap toolchain
+        run: sudo ./tools/bootstrap.sh
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+      - name: Configure + build
+        run: |
+          cmake --preset dev
+          cmake --build --preset dev --target gui-dod-harness
+      - run: cd tools/mockd && npm ci
+      - name: RSS soak (10 min)
+        run: gui/tests/dod/run.sh rss-flat --json rss.json
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: gui-dod-rss-${{ github.run_id }}
+          path: rss.json
@@ -64,6 +64,19 @@ std::string lower(std::string s) {
    return s;
 }

+// scheme://host[:port] of `url`, with no path/query/fragment -- what docs/04 §7's "403
+// after redirect: retry once with the original referrer" retries with as the Referer
+// header. Empty on an unparseable URL (the caller just won't get a referrer retry).
+std::string origin_of(std::string_view url) {
+    auto s = net::split_url(url);
+    if (!s.valid)
+        return {};
+    std::string out = s.scheme + "://" + s.host;
+    if (s.port)
+        out += ":" + std::to_string(*s.port);
+    return out;
+}
+
 }  // namespace

 // What to do once every worker has drained (see DownloadTaskState::begin_drain_locked).
@@ -88,6 +101,7 @@ struct SegWorker {
    bool needs_auth = false;
    bool wrong_status = false;
    bool range_bad = false;
+    bool forbidden = false;  // 403 -- docs/04 §7's "retry once with the original referrer"
    bool auth_handshake = false;  // saw a 401/407 and let libcurl resend with credentials
    std::string resp_etag, resp_last_modified;  // captured on a wrong_status 200, for demote
    std::optional<ErrorInfo> flush_error;
@@ -135,6 +149,16 @@ struct DownloadTaskState : std::enable_shared_from_this<DownloadTaskState> {
    std::optional<std::uint64_t> total_size;
    std::string origin_host;

+    // docs/04 §7's "403 after redirect: retry once with the original referrer" -- many
+    // CDNs 403 a bare/foreign Referer. Starts as spec.referrer (the browser's, verbatim);
+    // start_worker_locked() sends this, not spec.referrer directly, so a 403 retry can
+    // override it (to the download URL's own origin) without touching what the caller
+    // actually asked for. referrer_retried bounds it to exactly once per task -- a second
+    // 403 with a same-origin Referer already set is a real, honest failure
+    // (Error::forbidden), not something a referrer swap can fix.
+    std::string effective_referrer;
+    bool referrer_retried = false;
+
    std::unique_ptr<segment::Segmenter> seg;
    std::unique_ptr<io::SparseFile> file;
    std::unordered_map<std::uint32_t, std::unique_ptr<SegWorker>> workers;
@@ -164,7 +188,7 @@ struct DownloadTaskState : std::enable_shared_from_this<DownloadTaskState> {
    std::vector<std::function<void()>> deferred;

    DownloadTaskState(TaskHost &h, TaskId i, DownloadSpec s, DownloadCallbacks c)
-        : host(h), id(i), spec(std::move(s)), cbs(std::move(c)) {}
+        : host(h), id(i), spec(std::move(s)), cbs(std::move(c)), effective_referrer(spec.referrer) {}

    // --- deferred callbacks -------------------------------------------------------------
    void defer(std::function<void()> fn) {
@@ -286,7 +310,7 @@ void DownloadTaskState::restart_probe(bool with_auth) {
    pr.url = spec.url;
    pr.headers = spec.headers;
    pr.cookies = spec.cookies;
-    pr.referrer = spec.referrer;
+    pr.referrer = effective_referrer;
    pr.user_agent = spec.user_agent;
    pr.proxy = spec.proxy;
    if (with_auth)
@@ -299,12 +323,37 @@ void DownloadTaskState::restart_probe(bool with_auth) {
 }

 void DownloadTaskState::on_probe_result(Result<net::ProbeResult> r) {
+    bool retry_probe_with_referrer = false;
    {
        std::unique_lock lk(mu);
        if (retired.load() || is_terminal(state))
            return;
        if (!r.has_value()) {
-            fail_locked(std::move(r).error());
+            ErrorInfo e = std::move(r).error();
+            // docs/04 §7's referrer retry applies here too: a probe (HEAD, or the
+            // ranged-GET fallback when HEAD is refused -- probe.cpp) can be the request
+            // that actually gets 403'd, before any segment worker exists to retry it
+            // (net::Prober builds its own request from ProbeRequest::referrer, not
+            // through start_worker_locked() -- see restart_probe()'s use of
+            // effective_referrer below). Same one-shot bound via referrer_retried as the
+            // worker-level retry (seg_finished's w->forbidden branch) shares.
+            if (e.code == Error::forbidden && !referrer_retried) {
+                referrer_retried = true;
+                effective_referrer = origin_of(spec.url);
+                retry_probe_with_referrer = true;
+            } else if (e.code == Error::forbidden) {
+                // Already retried with the origin referrer and still 403 -- not something
+                // another blind retry fixes (an expired signed URL, a private resource).
+                // Ask rather than fail outright, the same "ask, don't just fail" shape as
+                // wrong_status/range_bad/the worker-level 403 branch: refresh_url() is a
+                // no-op once the task is terminal, and tools/testserver's expiring-signed-
+                // url mode (also a bare 403, indistinguishable from any other without
+                // parsing the body -- CLAUDE.md §3, core never does) is meant to be
+                // recovered exactly that way.
+                auto_pause_locked(std::move(e), false, true);
+            } else {
+                fail_locked(std::move(e));
+            }
        } else {
            probe = std::move(r).value();
            have_probe = true;
@@ -319,6 +368,8 @@ void DownloadTaskState::on_probe_result(Result<net::ProbeResult> r) {
        }
    }
    flush_deferred();
+    if (retry_probe_with_referrer)
+        restart_probe(false);
 }

 void DownloadTaskState::finish_probe_locked() {
@@ -472,7 +523,7 @@ void DownloadTaskState::start_worker_locked(std::uint32_t seg_idx) {
    req.url = current_url();
    req.headers = spec.headers;
    req.cookies = spec.cookies;
-    req.referrer = spec.referrer;
+    req.referrer = effective_referrer;
    req.user_agent = spec.user_agent;
    req.proxy = spec.proxy;
    req.auth = spec.auth;
@@ -552,6 +603,10 @@ net::DataAction DownloadTaskState::seg_head(std::uint32_t seg_idx, const net::Re
        w->range_bad = true;
        return net::DataAction::abort;
    }
+    if (h.status == 403) {
+        w->forbidden = true;
+        return net::DataAction::abort;
+    }
    if (h.status >= 400)
        return net::DataAction::abort;
    seg->set_segment_state(seg_idx, segment::SegState::downloading);
@@ -637,7 +692,7 @@ void DownloadTaskState::seg_finished(std::uint32_t seg_idx, Result<net::Transfer
    // (content-length-mismatch's honest-length lie, flaky-reset's tail, a proxy RST after
    // the last byte). If the segment is fully covered, that's a success.
    if (seg && !cancel_requested && !pause_requested && !w->needs_auth && !w->wrong_status &&
-        !w->flush_error && !w->range_bad) {
+        !w->flush_error && !w->range_bad && !w->forbidden) {
        const std::uint64_t len = seg->segment_end(seg_idx) - seg->segment_start(seg_idx) + 1;
        if (len != 0 && seg->segment_completed(seg_idx) >= len) {
            r = Result<net::TransferStats>(net::TransferStats{});
@@ -756,6 +811,35 @@ void DownloadTaskState::seg_finished(std::uint32_t seg_idx, Result<net::Transfer
        auto_pause_locked(ErrorInfo(Error::range_not_satisfiable, "416"), false, true);
        return done();
    }
+    if (w->forbidden) {
+        // docs/04 §7: "403 after redirect: retry once with the original referrer -- many
+        // CDNs require it." Bare/foreign Referer is the common cause; origin_of() rebuilds
+        // it from the (possibly redirected) URL the response actually came from. Exactly
+        // once per task, not a backoff series -- a second 403 with a same-origin Referer
+        // already set isn't something another blind retry can fix (a private/expired
+        // resource, an expiring signed URL past its window, ...). That's not necessarily
+        // terminal, though: ask (same "ask, don't just fail outright" shape as
+        // wrong_status/range_bad above) rather than fail_locked() outright, specifically
+        // so DownloadHandle::refresh_url() -- do_refresh_url() is a no-op once the task is
+        // terminal -- stays usable for the case tools/testserver's README pairs it with:
+        // a caller that gets a fresh signed URL and hands it back.
+        release_slot();
+        if (!referrer_retried) {
+            referrer_retried = true;
+            effective_referrer = origin_of(current_url());
+            seg->set_segment_state(seg_idx, segment::SegState::stalled);
+            auto wp = weak_from_this();
+            host.schedule(std::chrono::steady_clock::now(), [wp, seg_idx] {
+                if (auto s = wp.lock())
+                    s->retry_worker(seg_idx);
+            });
+            if (workers.empty())
+                transition(EngineState::retry_wait, std::nullopt);
+        } else {
+            auto_pause_locked(ErrorInfo(Error::forbidden, "403", w->http_status), false, true);
+        }
+        return done();
+    }

    if (!r.has_value()) {
        ErrorInfo e = std::move(r).error();
@@ -1215,6 +1299,7 @@ void DownloadTaskState::do_refresh_url(std::string url, std::vector<net::HeaderF
    net::ProbeRequest pr;
    pr.url = spec.url;
    pr.headers = spec.headers;
+    pr.referrer = effective_referrer;
    pr.auth = spec.auth;
    pr.proxy = spec.proxy;
    host.probe(std::move(pr), [wp](Result<net::ProbeResult> r) {
@@ -1224,10 +1309,43 @@ void DownloadTaskState::do_refresh_url(std::string url, std::vector<net::HeaderF
        std::unique_lock lk(s->mu);
        if (s->retired.load() || is_terminal(s->state))
            return;
-        if (r.has_value()) {
-            s->probe.effective_url = r.value().effective_url;
-            s->probe.etag = r.value().etag;
-            s->probe.last_modified = r.value().last_modified;
+        if (!r.has_value()) {
+            lk.unlock();
+            s->flush_deferred();
+            return;  // still paused; the caller can retry refresh_url() or decide()
+        }
+        if (!s->have_probe) {
+            // The task's *first* probe never succeeded (e.g. this session's own
+            // expiring-signed-url path: 403, one referrer retry, still 403 -> ask rather
+            // than fail outright -- see on_probe_result() -- specifically so this branch
+            // exists to recover it). finish_probe_locked() is what actually registers the
+            // task with the budget and builds its Segmenter; nothing downstream of a
+            // partial field copy would ever start a worker without it.
+            s->probe = std::move(r).value();
+            s->have_probe = true;
+            s->awaiting_auth = false;
+            s->awaiting_decision = false;
+            s->finish_probe_locked();
+            lk.unlock();
+            s->flush_deferred();
+            return;
+        }
+        s->probe.effective_url = r.value().effective_url;
+        s->probe.etag = r.value().etag;
+        s->probe.last_modified = r.value().last_modified;
+        // refresh_url()'s own contract is "on a live OR PAUSED task, without losing
+        // progress" -- distinct from do_decide(restart), which discards progress. A task
+        // can be paused here for any of three reasons (a plain user pause, awaiting_auth,
+        // or awaiting_decision -- e.g. this session's own 403-after-referrer-retry path,
+        // or the pre-existing wrong_status/range_bad ones); apply_slot_target()'s guard
+        // blocks on awaiting_auth/awaiting_decision specifically, so leaving either set
+        // would have set_want() below recompute a target that nothing ever acts on --
+        // the caller's new URL re-probed successfully and then the task just sat there.
+        // Clear both and leave `paused` the same way do_decide(restart) does.
+        if (s->state == EngineState::paused) {
+            s->awaiting_auth = false;
+            s->awaiting_decision = false;
+            s->transition(EngineState::connecting, std::nullopt);
        }
        if (s->registered)
            s->host.budget().set_want(s->id, s->want_slots());
@@ -28,7 +28,14 @@ namespace vdm::testing {

 class TestServer {
  public:
-    TestServer() {
+    TestServer() : TestServer(1.0) {}
+
+    // loris_seconds overrides the dribble duration slow-loris mode uses (default matches the
+    // no-arg ctor's long-standing 1s). A test that needs curl's stall detector
+    // (CURLOPT_LOW_SPEED_TIME, hardcoded to 30s in download_task.cpp) to actually fire needs a
+    // dribble that outlasts that threshold, not the short one every other test relies on to
+    // keep runtime down.
+    explicit TestServer(double loris_seconds) {
        const char *script = VDM_TESTSERVER_PY;
        if (!script || !*script || ::access(script, R_OK) != 0)
            return;
@@ -50,8 +57,9 @@ class TestServer {
            int devnull = ::open("/dev/null", O_WRONLY);
            if (devnull >= 0)
                ::dup2(devnull, STDERR_FILENO);
+            std::string loris_str = std::to_string(loris_seconds);
            ::execlp("python3", "python3", script, "--port", "0", "--seed", "9", "--loris-seconds",
-                     "1", "--throttle-bps", "131072", static_cast<char *>(nullptr));
+                     loris_str.c_str(), "--throttle-bps", "131072", static_cast<char *>(nullptr));
            ::_exit(127);
        }
        ::close(pipefd[1]);
@@ -124,6 +124,31 @@ std::string server_sha(TestServer &srv, const std::string &mode, const std::stri
    return out.substr(open + 1, close - open - 1);
 }

+// Small, deliberately identical extraction to server_sha's: GET /<mode>/sign/<size>?ttl=N
+// and pull the "url" field's value out of the {"url":..., "exp":...} JSON body.
+std::string sign_url(TestServer &srv, const std::string &mode, const std::string &size,
+                     int ttl_seconds) {
+    std::string url =
+        srv.url("/" + mode + "/sign/" + size + "?ttl=" + std::to_string(ttl_seconds));
+    std::string cmd = "curl -s '" + url + "'";
+    std::string out;
+    if (FILE *f = ::popen(cmd.c_str(), "r")) {
+        char buf[1024];
+        while (std::fgets(buf, sizeof buf, f))
+            out += buf;
+        ::pclose(f);
+    }
+    auto q = out.find("\"url\"");
+    if (q == std::string::npos)
+        return {};
+    auto colon = out.find(':', q);
+    auto open = out.find('"', colon);
+    auto close = out.find('"', open + 1);
+    if (open == std::string::npos || close == std::string::npos)
+        return {};
+    return out.substr(open + 1, close - open - 1);
+}
+
 DownloadSpec spec_for(TestServer &srv, const std::string &urlpath, const std::string &save) {
    DownloadSpec s;
    s.url = srv.url(urlpath);
@@ -328,6 +353,30 @@ VT_TEST(engine_401_then_provide_auth_completes) {
    VT_CHECK_EQ(file_size(td.file("au.bin")), 1u * 1024 * 1024);
 }

+VT_TEST(engine_401_digest_then_provide_auth_completes) {
+    // Same shape as engine_401_then_provide_auth_completes, but the challenge is HTTP
+    // Digest (qop=auth) rather than Basic. provide_auth() doesn't know or care which --
+    // http_client.cpp always asks libcurl for CURLAUTH_ANY (net::AuthScheme::any) and lets
+    // curl negotiate against whatever WWW-Authenticate the server actually sent -- so this
+    // exists purely to prove that's true end-to-end, not just at the unit level.
+    TestServer srv;
+    VT_REQUIRE(srv.available());
+    TmpDir td;
+    Recorder rec;
+    Engine eng;
+    DownloadHandle h;
+    auto cbs = rec.cbs(&h, "test", "test");
+    h = eng.start(spec_for(srv, "/401-digest/file/1M", td.file("dg.bin")), std::move(cbs));
+    rec.arm(h);
+
+    auto r = rec.wait();
+    VT_REQUIRE(r.has_value());
+    VT_CHECK(rec.auth_calls.load() >= 1);
+    VT_CHECK_EQ(file_size(td.file("dg.bin")), 1u * 1024 * 1024);
+    auto got = hash_file(td.file("dg.bin"), Checksum::Algo::sha256);
+    VT_CHECK_EQ(got.value(), server_sha(srv, "401-digest", "1M"));
+}
+
 // --- hostile-mode matrix: the four where a bug is silent corruption, not a visible
 // failure (docs/04 §5 "ask, never silently corrupt" / §7's failure-policy table). ---

@@ -458,6 +507,142 @@ VT_TEST(engine_content_length_mismatch_fails_honestly) {
    VT_CHECK_EQ(::access(td.file("clm.bin").c_str(), F_OK), -1);  // never renamed into place
 }

+// --- remaining hostile-mode matrix (tools/testserver/README.md's mode table). ---
+
+VT_TEST(engine_expiring_signed_url_recovers_via_refresh_url) {
+    // A signed URL past its ttl 403s (tools/testserver's own JSON body distinguishes
+    // "expired" from "bad signature", but core never parses response bodies -- CLAUDE.md
+    // §3 -- so both just read as a 403). The one automatic referrer retry (see
+    // engine_403_without_referer_retries_with_origin, below) can't fix an expired
+    // signature, so the second 403 asks -- via the same auto_pause_locked(..., false,
+    // true) "ask, don't just fail" path as wrong_status/range_bad -- rather than
+    // terminally failing outright, specifically so DownloadHandle::refresh_url() (its own
+    // contract: works "on a live or paused task", never on a terminal one) stays usable:
+    // the README pairs this mode with exactly that recovery.
+    TestServer srv;
+    VT_REQUIRE(srv.available());
+    TmpDir td;
+    Recorder rec;
+    Engine eng;
+
+    std::string expired = sign_url(srv, "expiring-signed-url", "64K", /*ttl=*/1);
+    VT_REQUIRE(!expired.empty());
+    std::this_thread::sleep_for(1500ms);  // let the ttl actually pass before the first request
+
+    DownloadSpec s;
+    s.url = expired;
+    s.save_path = td.file("exp.bin");
+    auto h = eng.start(std::move(s), rec.cbs());
+
+    for (int i = 0; i < 300 && rec.decision_calls.load() == 0; ++i)
+        std::this_thread::sleep_for(20ms);
+    VT_REQUIRE(rec.decision_calls.load() >= 1);
+    VT_CHECK_EQ(h.state(), EngineState::paused);
+
+    std::string fresh = sign_url(srv, "expiring-signed-url", "64K", /*ttl=*/60);
+    VT_REQUIRE(!fresh.empty());
+    h.refresh_url(fresh);
+
+    auto r = rec.wait(60s);
+    VT_REQUIRE(r.has_value());
+    VT_CHECK_EQ(file_size(td.file("exp.bin")), 64u * 1024);
+    auto got = hash_file(td.file("exp.bin"), Checksum::Algo::sha256);
+    VT_CHECK_EQ(got.value(), server_sha(srv, "expiring-signed-url", "64K"));
+}
+
+VT_TEST(engine_403_without_referer_retries_with_origin) {
+    // docs/04 §7: "403 after redirect: retry once with the original referrer -- many CDNs
+    // require it." No spec.referrer is set here (the common case for anything not
+    // initiated from a browser page, e.g. `velox add <url>`), so the first attempt 403s;
+    // the engine's own retry supplies the download URL's own origin as Referer, which
+    // this mode accepts, and the download completes with no decision ever asked.
+    TestServer srv;
+    VT_REQUIRE(srv.available());
+    TmpDir td;
+    Recorder rec;
+    Engine eng;
+    auto h = eng.start(spec_for(srv, "/403-without-referer/file/128K", td.file("ref.bin")),
+                       rec.cbs());
+    auto r = rec.wait(30s);
+    VT_REQUIRE(r.has_value());
+    VT_CHECK_EQ(rec.decision_calls.load(), 0);  // recovered automatically, not asked
+    VT_CHECK_EQ(file_size(td.file("ref.bin")), 128u * 1024);
+    auto got = hash_file(td.file("ref.bin"), Checksum::Algo::sha256);
+    VT_CHECK_EQ(got.value(), server_sha(srv, "403-without-referer", "128K"));
+}
+
+VT_TEST(engine_redirect_chain_follows_to_completion) {
+    // 5 hops (tools/testserver's own --redirect-depth default) of a plain 302, query
+    // string preserved across each. No CORE-side logic needed for this one -- libcurl's
+    // own CURLOPT_FOLLOWLOCATION (RequestOptions::follow_redirects, already on) and
+    // CURLOPT_MAXREDIRS (default 20, well over 5) do the whole thing -- this is here as
+    // the end-to-end check that they're actually wired through both the probe and every
+    // segment worker's own request, not just one of the two.
+    TestServer srv;
+    VT_REQUIRE(srv.available());
+    TmpDir td;
+    Recorder rec;
+    Engine eng;
+    auto h = eng.start(spec_for(srv, "/redirect-chain/file/1M", td.file("rc.bin")), rec.cbs());
+    auto r = rec.wait(30s);
+    VT_REQUIRE(r.has_value());
+    VT_CHECK_EQ(file_size(td.file("rc.bin")), 1u * 1024 * 1024);
+    auto got = hash_file(td.file("rc.bin"), Checksum::Algo::sha256);
+    VT_CHECK_EQ(got.value(), server_sha(srv, "redirect-chain", "1M"));
+}
+
+VT_TEST(engine_slow_loris_stall_timeout_fires) {
+    // Status line, headers, and body dribbled out one byte at a time for --loris-seconds,
+    // then (if the dribble hasn't already been cut off) normal streaming -- a connection
+    // that's technically alive (bytes ARE arriving, just far too slowly) but must not be
+    // allowed to hang the task forever. http_client.cpp sets CURLOPT_LOW_SPEED_LIMIT/_TIME
+    // (RequestOptions::low_speed_bytes_per_sec/low_speed_secs, hardcoded in
+    // download_task.cpp to 1024 B/s for 30s) for exactly this.
+    //
+    // Every other test in this file uses TestServer's default 1s loris dribble to keep
+    // runtime down, but 1s is far shorter than curl's 30s low_speed_time: a 1s trickle
+    // followed by full-speed streaming never accumulates 30 CONSECUTIVE seconds under the
+    // floor, so curl would never actually abort it -- the download would just complete
+    // slightly late, which would make this test pass for the wrong reason (or not exercise
+    // the stall timeout at all). Explicitly ask for a dribble that outlasts the 30s
+    // threshold so the stall timeout is the thing actually observed firing, not assumed.
+    TestServer srv(40.0);
+    VT_REQUIRE(srv.available());
+    TmpDir td;
+    Recorder rec;
+    Engine eng;
+    auto s = spec_for(srv, "/slow-loris/file/64K", td.file("sl.bin"));
+    s.segments = 1;
+    s.max_retries = 1;
+    auto h = eng.start(std::move(s), rec.cbs());
+    auto r = rec.wait(60s);  // stall timeout fires ~30s in; must resolve, not hang to 60s
+    VT_REQUIRE(!r.has_value());
+    VT_CHECK(is_retryable(r.error().code) || r.error().code == Error::max_retries_exhausted);
+}
+
+VT_TEST(engine_chunked_no_length_completes_single_segment) {
+    // No Content-Length anywhere (HEAD gets none either, since it's the same handler path)
+    // -- the probe can't know total_size or prove resumability, so this should take the
+    // exact same "unknown size, one plain-GET segment" path as engine_non_resumable_single_
+    // segment, just arriving there via a chunked body instead of a server that plainly
+    // refuses Range. No core-side work needed if that demotion is already size-agnostic;
+    // this is here to prove it, since every other test's server tells the probe the size
+    // up front.
+    TestServer srv;
+    VT_REQUIRE(srv.available());
+    TmpDir td;
+    Recorder rec;
+    Engine eng;
+    auto h = eng.start(spec_for(srv, "/chunked-no-length/file/2M", td.file("ch.bin")),
+                       rec.cbs());
+    auto r = rec.wait();
+    VT_REQUIRE(r.has_value());
+    VT_CHECK_EQ(rec.decision_calls.load(), 0);
+    VT_CHECK_EQ(file_size(td.file("ch.bin")), 2u * 1024 * 1024);
+    auto got = hash_file(td.file("ch.bin"), Checksum::Algo::sha256);
+    VT_CHECK_EQ(got.value(), server_sha(srv, "chunked-no-length", "2M"));
+}
+
 // --- DAEMON-reported bug: Progress.speed_bps reads 0 for the whole life of a live
 // download while downloaded bytes visibly advance. DAEMON reads progress by polling
 // DownloadHandle::progress() (engine_port_core.hpp), not the on_progress push callback --
@@ -53,6 +53,24 @@ capture, and the Add-URL dialog pre-fills from the clipboard when opened. Backgr
 monitoring is a bonus if the spike says yes. **Do not let this block the release, and do
 not promise it in the UI before S2 answers.**

+**Spike S2, item (c) answered — verified live, not the full spike:** on this desktop
+(GNOME/Mutter, Ubuntu 26.04, plain non-Flatpak/non-snap process), `CreateSession` on
+`org.freedesktop.portal.GlobalShortcuts` refuses every caller with `"An app id is
+required"` — reproduced two ways: `gui/src/clipboard/GlobalShortcut.cpp`'s real async
+D-Bus call, and a bare `busctl --user call … CreateSession` from an interactive shell
+(no Qt involved at all), both under a real Wayland session (`WAYLAND_DISPLAY` set), not
+just offscreen. Because the second reproduction has no Qt/app-level identity to configure
+at all and still fails identically, this looks like the portal requiring the caller's
+*bus connection* to already carry a sandboxed app id (Flatpak/snap portal-confined) —
+something no amount of `QGuiApplication::setDesktopFileName()` or similar can supply from
+an unconfined process. **Practical read:** the global-shortcut explicit path likely does
+not work at all for Velox as a traditionally-packaged (.deb/AppImage) app on stock
+GNOME — only if/when it ships confined. The code is still in (best-effort, fails silent
+exactly like this, never advertised — see the file's own header), since it costs nothing
+and activates automatically the day that changes. Items (a) `QClipboard::dataChanged`
+cross-app, (b) `wlr-data-control`, and (d) XWayland fallback are **still unanswered** —
+this was one item of S2's four, not the full spike.
+
 ---

 ## R3 — AMO review friction 🟠 MEDIUM
@@ -0,0 +1,45 @@
+# ADR 0019 — The live-`veloxd` conformance runner is a required check, as-is
+
+**Status:** accepted · **Date:** 2026-09-12 · **Lane:** PKG/QA
+
+## Context
+
+`tests/conformance/run.sh` step 3b (ADR 0014's `conformance` ctest, already required
+per `.github/BRANCH_PROTECTION.md`) replays every fixture against a real, isolated
+`veloxd` it builds and starts — not just mockd, which only proves the TS client and the
+fixtures agree with each other. This is the runner that can catch `veloxd` disagreeing
+with its own contract, and it is unconditional in `run.sh` (`set -euo pipefail`, no
+skip flag): it already runs, and already blocks, inside the `conformance` job.
+
+What was open was whether to treat that as a settled, defended gate or as something
+still provisional while `daemon/docs/deferrals.md`'s D1-D4b stub handlers were excused
+via `veloxd-xfail.json`. PROTO's update: 57/57 fixtures pass on `main`, and the xfail
+allowlist is down to 18 entries from 34 as DAEMON lands the deferred handlers behind
+them.
+
+## Decision
+
+The live-`veloxd` conformance runner stays required — no change to CI is needed, since
+it already runs inside the already-required `conformance` job (ADR 0014). What this ADR
+records is the standing: PKG/QA is not carving out an exception, a `continue-on-error`,
+or a separate advisory job for it while the xfail list shrinks. A regression here fails
+the same required check a schema mismatch would.
+
+Verified, not assumed: `tests/conformance/veloxd-xfail.json` has 18 entries as of this
+ADR (`python3 -c "import json; print(len(json.load(open('tests/conformance/veloxd-xfail.json'))))"`).
+Each remaining entry excuses one still-stubbed handler on `deferrals.md`'s D-list, not a
+real disagreement between `veloxd` and its contract — `tests/conformance/README.md`
+already draws that line (an entry for anything else is a `run.sh`-detected "xfail entry
+unexpectedly passed" or a straight failure, not a quiet pass).
+
+## Consequences
+
+- No `ci.yml` or `BRANCH_PROTECTION.md` change: `conformance` was already listed
+  required, and this runner was already inside it.
+- The xfail list is a visible, shrinking number, not a static allowance — as DAEMON
+  clears more of `deferrals.md`'s D-list, entries come out of
+  `tests/conformance/veloxd-xfail.json`, and `replay.ts` fails loudly (per
+  `applyXfail`'s "unexpectedly passed" check) if one is left in after its handler ships.
+- Nothing here changes who owns what: `veloxd-xfail.json` and `run.sh` stay PROTO's;
+  PKG/QA's role is the branch-protection policy this ADR confirms, not the runner
+  itself.
@@ -19,7 +19,12 @@ import {
 } from './context-menus.js';
 import { MediaBridge, notifyTab } from './media-bridge.js';
 import { createTransport, transportStorage, type TransportStatus, type VeloxTransport } from './transport/index.js';
-import type { CaptureOfferParams, CaptureRules, DownloadSpec } from '../shared/protocol/index.js';
+import {
+  SESSION_SUBSCRIBE_PARAMS_EVENTS_ITEM_VALUES,
+  type CaptureOfferParams,
+  type CaptureRules,
+  type DownloadSpec,
+} from '../shared/protocol/index.js';

 let transport: VeloxTransport | undefined;
 let rules: CaptureRules = DEFAULT_CAPTURE_RULES;
@@ -75,10 +80,31 @@ async function refreshRules(): Promise<void> {
  }
 }

+/**
+ * "Nothing is delivered until this is called" (session.subscribe's own description) —
+ * without it, event.task.progress et al. never reach this connection at all, no matter
+ * how many listeners bridge.ts registers locally. Requests the whole set every time
+ * because any popup/options document could open at any moment and none of them narrow
+ * per-tab; a fresh connection (first connect, or after a drop) starts with nothing
+ * subscribed until this runs again.
+ */
+async function subscribeToEvents(): Promise<void> {
+  try {
+    await mustTransport().call('session.subscribe', {
+      events: [...SESSION_SUBSCRIBE_PARAMS_EVENTS_ITEM_VALUES],
+    });
+  } catch {
+    // Best-effort; a reconnect (or the next event.settings.changed-driven refresh) retries.
+  }
+}
+
 function onTransportState(status: TransportStatus): void {
  const detail = status.fatal ?? (status.needsPairing ? 'needs pairing' : '');
  console.debug(`[velox] transport ${status.state}${detail ? ` — ${detail}` : ''}`);
-  if (status.state === 'connected') void refreshRules();
+  if (status.state === 'connected') {
+    void refreshRules();
+    void subscribeToEvents();
+  }
 }

 async function setOverride(override: 'auto' | 'ws' | 'uds'): Promise<void> {
@@ -0,0 +1,389 @@
+// Runs the transport, the capture hook, and the popup event path against a REAL veloxd
+// — not FakeDaemon. Everything else in this suite is faithful to the documented wire
+// protocol, but "faithful" isn't "real"; this is what actually proves it.
+//
+// Requires VELOXD_BIN (path to a built veloxd) in the environment. Skips itself with a
+// clear message otherwise, so `npm test` and CI (no daemon binary lying around) are
+// unaffected. Run it like:
+//
+//   VELOXD_BIN=/path/to/build/dev/bin/veloxd npx vitest run tests/live
+//
+// Each veloxd instance gets its own scratch XDG_RUNTIME_DIR/XDG_DATA_HOME/
+// XDG_CONFIG_HOME/HOME (main.cpp's single-instance lock is keyed to the runtime dir, so
+// this can run alongside another developer's or CI's own veloxd on the same machine).
+// VELOX_PAIR_AUTO=1 stands in for the GUI's Allow-prompt approver during dev/test
+// (rpc/pairing.hpp's EnvAutoApprover) — pairing itself is exercised for real, only the
+// human click is stubbed.
+import { spawn, type ChildProcessWithoutNullStreams } from 'node:child_process';
+import { mkdtempSync, mkdirSync, rmSync } from 'node:fs';
+import { readFile } from 'node:fs/promises';
+import { tmpdir } from 'node:os';
+import { dirname, join, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import { WebSocket as WsClient } from 'ws';
+
+import { RpcError, TransportClosedError } from '../../src/background/transport/types.js';
+import { WebSocketTransport, type WebSocketCtor, type WebSocketTransportDeps } from '../../src/background/transport/websocket.js';
+import { CaptureHook } from '../../src/background/capture/index.js';
+import type { OnHeadersReceivedDetails } from '../../src/background/capture/index.js';
+import type { CaptureRules, DownloadSpec, TaskProgressEvent, TaskStateEvent } from '../../src/shared/protocol/index.js';
+
+const VELOXD_BIN = process.env.VELOXD_BIN;
+const REPO_ROOT = resolve(dirname(fileURLToPath(import.meta.url)), '../../..');
+const TESTSERVER_PY = join(REPO_ROOT, 'tools/testserver/testserver.py');
+
+// A fixed moz-extension origin, used both as session.pair's extensionId and as the WS
+// upgrade's Origin header — real Firefox sets the latter itself; ws's client needs it
+// spelled out (docs/05 §4: the daemon refuses the upgrade without a moz-extension:// Origin).
+const EXTENSION_ID = '11111111-2222-3333-4444-555555555555';
+const ORIGIN = `moz-extension://${EXTENSION_ID}`;
+
+class OriginWebSocket extends WsClient {
+  constructor(url: string) {
+    super(url, { origin: ORIGIN });
+  }
+}
+const CTOR = OriginWebSocket as unknown as WebSocketCtor;
+
+function sleep(ms: number): Promise<void> {
+  return new Promise((r) => setTimeout(r, ms));
+}
+
+async function waitFor(cond: () => Promise<boolean> | boolean, timeoutMs: number, what: string): Promise<void> {
+  const deadline = Date.now() + timeoutMs;
+  for (;;) {
+    if (await cond()) return;
+    if (Date.now() > deadline) throw new Error(`timed out waiting for ${what}`);
+    await sleep(50);
+  }
+}
+
+interface VeloxdInstance {
+  proc: ChildProcessWithoutNullStreams;
+  scratch: string;
+  wsPort: number;
+  /** True once the process has actually exited, by signal or otherwise. Node only sets
+   *  `proc.exitCode` for a normal exit — a signal-killed process reports its death via
+   *  `signalCode` and an `exit` event instead, never a non-null `exitCode`. */
+  hasExited(): boolean;
+  kill(signal?: NodeJS.Signals): void;
+}
+
+async function startVeloxd(bin: string): Promise<VeloxdInstance> {
+  const scratch = mkdtempSync(join(tmpdir(), 'velox-live-'));
+  const runtime = join(scratch, 'rt');
+  const data = join(scratch, 'data');
+  const config = join(scratch, 'cfg');
+  const home = join(scratch, 'home');
+  mkdirSync(runtime, { mode: 0o700 });
+  mkdirSync(data, { recursive: true });
+  mkdirSync(config, { recursive: true });
+  mkdirSync(join(home, 'Downloads'), { recursive: true });
+
+  const proc = spawn(bin, [], {
+    env: {
+      ...process.env,
+      VELOX_PAIR_AUTO: '1',
+      XDG_RUNTIME_DIR: runtime,
+      XDG_DATA_HOME: data,
+      XDG_CONFIG_HOME: config,
+      HOME: home,
+    },
+  });
+  let exited = false;
+  proc.on('exit', () => {
+    exited = true;
+  });
+  let stderr = '';
+  proc.stderr.on('data', (d) => {
+    stderr += String(d);
+  });
+
+  const portFile = join(runtime, 'velox', 'ws.port');
+  try {
+    await waitFor(async () => {
+      if (exited) throw new Error(`veloxd exited early (code ${proc.exitCode}, signal ${proc.signalCode}): ${stderr}`);
+      try {
+        await readFile(portFile);
+        return true;
+      } catch {
+        return false;
+      }
+    }, 10_000, 'veloxd to write ws.port');
+  } catch (e) {
+    proc.kill('SIGKILL');
+    rmSync(scratch, { recursive: true, force: true });
+    throw e;
+  }
+  const wsPort = Number((await readFile(portFile, 'utf8')).trim());
+
+  return {
+    proc,
+    scratch,
+    wsPort,
+    hasExited: () => exited,
+    kill(signal: NodeJS.Signals = 'SIGTERM') {
+      proc.kill(signal);
+    },
+  };
+}
+
+interface TestServerInstance {
+  proc: ChildProcessWithoutNullStreams;
+  baseUrl: string;
+}
+
+async function startTestServer(): Promise<TestServerInstance> {
+  const proc = spawn('python3', [TESTSERVER_PY, '--port', '0'], {});
+  let stdout = '';
+  let port: number | null = null;
+  proc.stdout.on('data', (d) => {
+    stdout += String(d);
+    const m = /^(\d+)\s*$/m.exec(stdout);
+    if (m) port = Number(m[1]);
+  });
+  await waitFor(() => port !== null, 5_000, 'testserver to print its port');
+  const baseUrl = `http://127.0.0.1:${port}`;
+  await waitFor(async () => {
+    try {
+      const res = await fetch(`${baseUrl}/__health`);
+      return res.ok;
+    } catch {
+      return false;
+    }
+  }, 5_000, 'testserver /__health');
+  return { proc, baseUrl };
+}
+
+function memDeps(init: { token?: string | null } = {}): { deps: WebSocketTransportDeps; store: { token: string | null } } {
+  const store = { token: init.token ?? null };
+  return {
+    store,
+    deps: {
+      getToken: async () => store.token,
+      setToken: async (t) => {
+        store.token = t;
+      },
+      getCachedPort: async () => null,
+      setCachedPort: async () => undefined,
+      extensionId: EXTENSION_ID,
+    },
+  };
+}
+
+function makeTransport(port: number, deps: WebSocketTransportDeps, extra: Partial<WebSocketTransportDeps> = {}): WebSocketTransport {
+  return new WebSocketTransport({
+    ...deps,
+    ...extra,
+    webSocketCtor: CTOR,
+    portRange: { start: port, end: port },
+    openTimeoutMs: 2000,
+  });
+}
+
+const maybeDescribe = VELOXD_BIN ? describe : describe.skip;
+
+if (!VELOXD_BIN) {
+  console.warn('tests/live/real-veloxd.test.ts: VELOXD_BIN not set — skipping (see file header).');
+}
+
+maybeDescribe('WebSocketTransport against a real veloxd', () => {
+  let daemon: VeloxdInstance;
+  let testserver: TestServerInstance;
+  // The mid-test fail-open case kills `daemon` and a later test starts a replacement —
+  // every scratch dir that ever existed gets cleaned up here, not just the last one.
+  const allScratchDirs: string[] = [];
+
+  async function freshVeloxd(): Promise<VeloxdInstance> {
+    const d = await startVeloxd(VELOXD_BIN!);
+    allScratchDirs.push(d.scratch);
+    return d;
+  }
+
+  beforeAll(async () => {
+    daemon = await freshVeloxd();
+    testserver = await startTestServer();
+  }, 20_000);
+
+  afterAll(() => {
+    daemon?.kill('SIGKILL');
+    testserver?.proc.kill('SIGKILL');
+    for (const dir of allScratchDirs) rmSync(dir, { recursive: true, force: true });
+  });
+
+  it('session.hello without a token surfaces NotPaired / needsPairing', async () => {
+    const { deps } = memDeps();
+    const t = makeTransport(daemon.wsPort, deps, { autoPair: false });
+    await expect(t.connect()).rejects.toBeInstanceOf(RpcError);
+    expect(t.status.needsPairing).toBe(true);
+    t.disconnect();
+  });
+
+  let pairedToken: string;
+
+  it('pairs (VELOX_PAIR_AUTO=1 stands in for the human Allow click) and hellos with the issued token', async () => {
+    const { deps, store } = memDeps();
+    const t = makeTransport(daemon.wsPort, deps); // autoPair: true (default)
+    await t.connect();
+    expect(t.state).toBe('connected');
+    expect(t.status.daemonVersion).toBeTruthy();
+    expect(store.token).toBeTruthy();
+    pairedToken = store.token!;
+    t.disconnect();
+  });
+
+  it('the pairing token survives a reconnect: a fresh transport reuses it with no fresh pairing', async () => {
+    const { deps } = memDeps({ token: pairedToken });
+    // autoPair: false — if this succeeds at all, it can only be because the stored
+    // token from the previous test was accepted outright, not because this transport
+    // silently re-paired.
+    const t = makeTransport(daemon.wsPort, deps, { autoPair: false });
+    await t.connect();
+    expect(t.state).toBe('connected');
+    t.disconnect();
+  });
+
+  it('a wrong token is rejected, and repeating it rate-limits the next pairing attempt', async () => {
+    // Five failed session.hello attempts from this origin (ws_server.cpp records a
+    // rate-limiter failure on every not-paired hello, not only on a failed session.pair)
+    // exhausts the window; the sixth thing this origin tries — a pairing attempt — gets
+    // RateLimited rather than a fresh token.
+    for (let i = 0; i < 5; i += 1) {
+      const { deps } = memDeps({ token: 'not-the-real-token' });
+      const t = makeTransport(daemon.wsPort, deps, { autoPair: false });
+      await expect(t.connect()).rejects.toBeInstanceOf(RpcError);
+      t.disconnect();
+    }
+
+    const { deps } = memDeps(); // no token -> autoPair kicks in -> session.pair
+    const t = makeTransport(daemon.wsPort, deps);
+    await expect(t.connect()).rejects.toBeInstanceOf(RpcError);
+    expect(t.status.needsPairing).toBe(true);
+    expect(t.status.retryAfterSec).toBeGreaterThan(0);
+    t.disconnect();
+  });
+
+  it('download.add creates a real task the engine picks up', async () => {
+    const { deps } = memDeps({ token: pairedToken });
+    const t = makeTransport(daemon.wsPort, deps, { autoPair: false });
+    await t.connect();
+    try {
+      const spec: DownloadSpec = { url: `${testserver.baseUrl}/plain/file/64K`, filename: 'plain-download.bin' };
+      const added = await t.call('download.add', spec);
+      expect(added.taskId).toBeTruthy();
+
+      await waitFor(async () => {
+        const detail = await t.call('download.get', { taskId: added.taskId });
+        const state = detail.summary.state;
+        return state === 'complete' || state === 'downloading' || state === 'verifying';
+      }, 10_000, 'the task to leave the queued state');
+    } finally {
+      t.disconnect();
+    }
+  }, 15_000);
+
+  it('capture.offer end to end: the real capture path takes a monitored download, ignores its own duplicate, and fails open when the daemon dies mid-offer', async () => {
+    const { deps } = memDeps({ token: pairedToken });
+    const t = makeTransport(daemon.wsPort, deps, { autoPair: false });
+    await t.connect();
+
+    const rules: CaptureRules = await t.call('capture.getRules', {});
+    expect(rules.monitoredExtensions).toContain('zip'); // seeded default (0001_initial.sql)
+
+    const hook = new CaptureHook({
+      offer: (params, opts) => t.call('capture.offer', params, opts),
+      stash: { take: () => undefined, peek: () => undefined },
+      getCookies: async () => [],
+      getRules: () => rules,
+      origin: ORIGIN,
+    });
+
+    // A throttled URL so the task the first offer creates is still active (not yet
+    // complete) when the dedupe offer for the same URL follows immediately after.
+    const url = `${testserver.baseUrl}/throttled/file/512K`;
+    const details: OnHeadersReceivedDetails = {
+      requestId: 'live-1',
+      url,
+      method: 'GET',
+      type: 'other',
+      statusCode: 200,
+      tabId: 1,
+      responseHeaders: [{ name: 'content-disposition', value: 'attachment; filename="live-capture.zip"' }],
+    };
+
+    const first = await hook.handle(details);
+    expect(first).toEqual({ cancel: true }); // the daemon took it — Firefox never starts its own download
+
+    const list = await t.call('download.list', { filter: { query: 'live-capture' } });
+    expect(list.items.length).toBeGreaterThan(0);
+    const task = list.items[0]!;
+    expect(task.categoryId).toBe('programs'); // "zip" routes to the built-in Programs category
+    expect(task.saveDir).toContain('Downloads/Programs');
+
+    // Same URL again, task still active: the daemon's own dedupe (has_active_duplicate)
+    // says Ignore, so the hook proceeds instead of cancelling a second time.
+    const dup = await hook.handle({ ...details, requestId: 'live-2' });
+    expect(dup).toEqual({});
+
+    // Now kill the daemon mid-offer and prove fail-open holds against the REAL binary,
+    // not just FakeDaemon: the hook must still resolve to {} (Firefox downloads
+    // normally) well inside its own 750 ms budget.
+    daemon.kill('SIGKILL');
+    await waitFor(() => daemon.hasExited(), 5_000, 'veloxd to actually die');
+
+    const started = Date.now();
+    const afterDeath = await hook.handle({ ...details, requestId: 'live-3', url: `${url}?after-death=1` });
+    const elapsedMs = Date.now() - started;
+    expect(afterDeath).toEqual({}); // fail open — never {cancel: true} with a dead daemon
+    expect(elapsedMs).toBeLessThan(900); // budget is 750ms; the hook's own timer bounds this
+
+    t.disconnect();
+  }, 20_000);
+
+  it('event.task.progress reaches a subscribed client (the popup\'s own path)', async () => {
+    if (daemon.hasExited()) {
+      // The previous test kills the daemon on purpose to prove fail-open; start a fresh
+      // one so this test still exercises the real event path end to end.
+      daemon = await freshVeloxd();
+    }
+    const { deps } = memDeps();
+    const t = makeTransport(daemon.wsPort, deps); // fresh daemon instance -> fresh pairing
+    await t.connect();
+    try {
+      await t.call('session.subscribe', {
+        events: ['event.task.added', 'event.task.state', 'event.task.progress'],
+      });
+
+      const progressEvents: TaskProgressEvent[] = [];
+      const stateEvents: TaskStateEvent[] = [];
+      t.on('event.task.progress', (p) => progressEvents.push(p as TaskProgressEvent));
+      t.on('event.task.state', (p) => stateEvents.push(p as TaskStateEvent));
+
+      const spec: DownloadSpec = { url: `${testserver.baseUrl}/throttled/file/1M`, filename: 'progress-check.bin' };
+      const added = await t.call('download.add', spec);
+
+      // /throttled defaults to 1 MiB/s, so a 1 MiB file takes ~1s — long enough that at
+      // least one 4 Hz progress tick (event.task.progress's documented cap) lands before
+      // it completes, exactly the path popup/store.ts consumes in the real extension.
+      await waitFor(
+        () => progressEvents.some((e) => e.tasks.some((row) => row.taskId === added.taskId)),
+        8_000,
+        'a live event.task.progress tick for our task',
+      );
+      expect(stateEvents.some((e) => e.taskId === added.taskId)).toBe(true);
+    } finally {
+      t.disconnect();
+    }
+  }, 15_000);
+
+  it('fail-open also holds through the transport itself: a call against a dead socket rejects, never hangs past its deadline', async () => {
+    const { deps } = memDeps();
+    const t = makeTransport(daemon.wsPort, deps);
+    await t.connect();
+    t.disconnect(); // closes the socket without telling the daemon anything is wrong
+    await expect(t.call('capture.offer', { url: 'https://example.com/x.zip', method: 'GET', tabUrl: '' }, { timeoutMs: 200 })).rejects.toBeInstanceOf(
+      TransportClosedError,
+    );
+  });
+});
@@ -35,10 +35,21 @@ add_library(velox-gui-lib STATIC
    src/dialogs/BatchDialog.cpp
    src/dialogs/GrabberWizard.cpp
    src/tray/TrayIcon.cpp
+    src/widgets/DropTargetWidget.cpp
+    src/util/ThemeManager.cpp
+    src/util/UiThreadWatchdog.cpp
    src/mainwindow/CategoryPanel.cpp
    src/mainwindow/MainWindow.cpp
 )

+# docs/03-gui-spec.md §7: the two QSS skins ThemeManager picks between, embedded so the
+# app needs no external file at runtime.
+qt_add_resources(velox-gui-lib "theme"
+    PREFIX "/qss"
+    BASE "resources/qss"
+    FILES resources/qss/idm-like.qss resources/qss/dark.qss
+)
+
 target_include_directories(velox-gui-lib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/src)
 target_compile_features(velox-gui-lib PUBLIC cxx_std_23)
 target_compile_options(velox-gui-lib PRIVATE -Wall -Wextra -Wpedantic -Werror)
@@ -47,8 +58,23 @@ target_link_libraries(velox-gui-lib PUBLIC
    Qt6::Widgets
    Qt6::Svg
    Qt6::Network
+    Threads::Threads
 )

+# docs/06-risks-and-spikes.md R2's explicit path #2 (a global shortcut via
+# org.freedesktop.portal.GlobalShortcuts) needs Qt6::DBus, which the root CMakeLists.txt
+# does not request yet (gui/docs/pkg-qa-requests-m1.md R4 — PKG/QA's file, not ours).
+# Guarded exactly like the veloxproto check above: compiles in automatically the moment
+# that lands, and MainWindow only wires it up when VELOX_GUI_HAVE_DBUS is defined.
+if(TARGET Qt6::DBus)
+    target_sources(velox-gui-lib PRIVATE src/clipboard/GlobalShortcut.cpp)
+    target_link_libraries(velox-gui-lib PUBLIC Qt6::DBus)
+    target_compile_definitions(velox-gui-lib PUBLIC VELOX_GUI_HAVE_DBUS)
+else()
+    message(STATUS "velox-gui: Qt6::DBus not available — the clipboard global-shortcut "
+                   "path (gui/docs/pkg-qa-requests-m1.md R4) is skipped, not broken.")
+endif()
+
 add_executable(velox-gui src/main.cpp)
 target_compile_options(velox-gui PRIVATE -Wall -Wextra -Wpedantic -Werror)
 target_link_libraries(velox-gui PRIVATE velox-gui-lib)
@@ -121,26 +121,101 @@ Notes for whoever applies it:

 ---

-## R3 — the GUI DoD gates have nowhere to run in CI
+## R3 — the GUI DoD gates have nowhere to run in CI — RESOLVED, ready to wire in

-To be precise about what already works: `VELOX_BUILD_GUI` defaults `ON`, the `ci` preset
-inherits `dev`, and once `gui/` is on `main` the `build` and `sanitizers` jobs configure
-and build `velox-gui` and run `ctest --preset ci`, which picks up all three GUI checks
-(`gui_downloadtablemodel`, `gui_rtl`, `gui_no_download_logic`). That part is covered.
+**Status: done on GUI's side.** The harness `tests/integration/README.md` was waiting on
+now exists, builds, and has been run end-to-end (all three gates, all three unhappy-path
+sub-phases) against a real `mockd` with no changes needed to the pre-drafted job below.

-What has no home is the part of the GUI M1 definition of done that isn't a unit test:
+**Path:** `gui/tests/dod/run.sh <gate> [--json <path>]`, exactly the contract
+`tests/integration/README.md` specifies. `<gate>` is `scroll-60fps` | `rss-flat` |
+`unhappy-path`. It builds and tears down its own `mockd` (isolated `XDG_RUNTIME_DIR` via
+`mktemp -d`), needs no network, and leaves nothing running on any exit path (`trap
+cleanup EXIT INT TERM`) — verified live by checking for orphaned `tsx`/`mockd` processes
+after both a passing and a forced-failing run of each gate.

-1. **10 000 rows scroll at 60 fps** (`mockd --tasks 10000`) — needs a frame-timing probe
-   against the offscreen (or Xvfb) view; red when a scroll frame exceeds ~16 ms at the
-   99th percentile.
-2. **Flat memory over 10 minutes of progress events** — needs RSS sampled across a
-   10-minute `mockd --tasks 10000` run; red when RSS grows more than a small fixed slack
-   (a leak in the progress-patch path is the thing this catches).
-3. **Unhappy-path recovery** — `mockd --slow`, `--flaky <f>`, `--drop-connection <s>`:
-   the client must show the banner and recover without a freeze or crash; red on a crash,
-   a hang (watchdog), or the connection state never returning to `Connected`.
+**One change from the pre-drafted job:** the "Configure + build" step needs to also build
+the harness binary, not just `velox-gui`:
+```diff
+- cmake --build --preset dev --target velox-gui
+ cmake --build --preset dev --target velox-gui gui-dod-harness
+```
+Nothing else in the pre-drafted YAML needs to change — the `# TODO(GUI): path` comment on
+the `scroll-60fps` line can just come off along with the marker on the line below it.

-GUI owns writing that harness (`gui/tests/` + a driver script, headless against `mockd`).
-Wiring it into `.github/workflows/ci.yml` as its own job — with the 10-minute one likely
-`nightly` rather than per-PR — is PKG/QA. Say the word and it comes over as a follow-up
-request with the job stanza pre-written.
+**`rss-flat`'s slack: 20 MiB (`VELOX_DOD_RSS_SLACK_KIB`, default `20480`).** Chosen by
+running the gate locally (`VELOX_DOD_RSS_DURATION_SEC=8` override, i.e. not the real
+10-minute number) a handful of times against `mockd --tasks 10000 --seed 1` and looking at
+actual post-warm-up growth (single-digit MiB per run here) — 20 MiB gives real headroom
+above that noise floor without being so loose a genuine per-tick leak in the progress-patch
+path could hide under it. This has **not** been proven against a full real 10-minute
+sanitized run (that's the nightly job's own first execution) or tuned against
+production-length data yet; treat it as GUI's stated starting number, not a
+load-tested constant, and expect it may need retuning after the first few real
+`gui-dod-nightly` runs land actual series data.
+
+**One caveat worth deciding on explicitly: the pre-drafted job builds with `cmake --preset
+dev`, i.e. ASan+UBSan (CLAUDE.md: "default for all lanes").** `scroll-60fps`'s frame
+budget already compensates (`gui/tests/dod/dod_harness.cpp` multiplies 16.6 ms by 4× when
+it detects a sanitized build — measured p99 here was ~50 ms against ASan overhead, well
+under the scaled 66.4 ms budget, so the multiplier is doing real work, not padding for no
+reason). `rss-flat`'s slack does **not** get a similar adjustment — ASan's allocator
+(redzones, quarantine) can look like real growth over a long run in a way this hasn't been
+validated against yet. Two honest options: run `gui-dod-nightly` against a `release`-preset
+build instead of `dev` (loses the sanitizers' own bug-catching value for this one job), or
+accept `VELOX_DOD_RSS_SLACK_KIB` may need a second, larger number for the ASan build once
+real 10-minute data exists. GUI's preference is the second (keep sanitizers on
+everywhere), but this is genuinely PKG/QA's call since it's their job definition.
+
+**Verified live**, under the exact `ASAN_OPTIONS=detect_leaks=1:halt_on_error=1` the
+`sanitizers` job already sets (checked against `.github/workflows/ci.yml` rather than
+assumed) — no leak-suppression flag needed, on any of the three gates:
+
+* `scroll-60fps` against `mockd --tasks 10000 --seed 1`: PASS at p99 ≈ 50 ms (budget
+  66.4 ms sanitized). Forced red once via `VELOX_DOD_FRAME_BUDGET_MS=1` to confirm the
+  fail path and exit code actually work, not just the pass path.
+* `rss-flat` at `VELOX_DOD_RSS_DURATION_SEC=6/8`: PASS, ~4-6 MiB growth against the
+  20 MiB slack.
+* `unhappy-path`, all three phases (`--slow 900`, `--flaky 0.3`, `--drop-connection 5`):
+  PASS. One real finding from building this: `--drop-connection` is currently a no-op
+  over the Unix socket transport in `mockd` itself (only wired for WebSocket) — filed as
+  `gui/docs/proto-requests-m1.md` since that's PROTO's file to fix, not GUI's. The gate
+  still passes today on the weaker (but real, and the actually-documented) condition that
+  the client reaches and holds `Connected`; it just isn't proving a real mid-session drop
+  yet for that one phase.
+
+Two bugs surfaced and fixed *by* building this harness, both in `gui/`'s own RPC client
+(caught by ASan, not assumed): `RpcClient::stop()` left `conn_` dangling after joining its
+worker thread, so any caller that called `stop()` and then let the client destruct hit a
+double-free — the harness's own `client.stop()` at shutdown found it on the first run.
+Separately, `RpcClient`'s initial `download.list` call had a hardcoded `limit: 1000` with
+no paging, silently capping the table at 1000 rows regardless of how many the daemon
+actually has — `scroll-60fps` against `--tasks 10000` refused to run rather than
+"passing" against a 1000-row table, which is what caught it. Both fixed on `lane/gui`
+before this request was filed.
+
+---
+
+## R4 — root `CMakeLists.txt`'s `find_package(Qt6 ...)` should list `DBus` explicitly
+
+Not currently broken — flagging a "works, but by accident" for the record. `gui/src/
+clipboard/GlobalShortcut.cpp` (docs/06-risks-and-spikes.md R2's explicit path #2:
+`org.freedesktop.portal.GlobalShortcuts`) needs `Qt6::DBus`. **Verified live: the target
+already exists and links today**, even though the root `find_package` doesn't list `DBus`
+in `COMPONENTS` — this Qt 6 packaging apparently exports every module's CMake target once
+any component pulls in the shared prefix, `DBus` included. `gui/CMakeLists.txt` still
+guards the clipboard sources on `if(TARGET Qt6::DBus)` (same pattern the file already uses
+for `veloxproto`), so if that turns out to be environment-specific rather than a general
+Qt 6 CMake guarantee, the build degrades to "feature skipped," not "build broken," on
+whatever machine finds out otherwise.
+
+Worth making explicit anyway, since relying on undocumented target leakage is fragile:
+
+```diff
+- find_package(Qt6 6.6 REQUIRED COMPONENTS Widgets Svg Network LinguistTools)
+ find_package(Qt6 6.6 REQUIRED COMPONENTS Widgets Svg Network DBus LinguistTools)
+```
+
+No apt change needed either way — `qt6-base-dev` (already in `APT_GUI`) ships `QtDBus`'s
+headers directly (verified live: `dpkg -L qt6-base-dev | grep -i dbus` lists the whole
+`QtDBus/` include tree).
@@ -0,0 +1,105 @@
+# GUI → PROTO requests (M1)
+
+Filed by lane GUI while building `gui/tests/dod/` (gui/docs/pkg-qa-requests-m1.md R3's
+harness). Touches `tools/mockd/` — PROTO-owned (CLAUDE.md §1) — so GUI is not making the
+edit. Apply-ready below.
+
+---
+
+## `mockd --drop-connection` is a no-op over the Unix socket transport
+
+`--drop-connection <s>` is documented as "terminate every connection every N seconds, to
+exercise reconnect logic" and is exactly what `gui/tests/dod/run.sh unhappy-path` needs
+for its drop-connection phase. It works — but only over WebSocket.
+
+**Repro:** `tools/mockd/src/index.ts`'s `startUds()` call passes `args.slow` and stops
+there:
+
+```ts
+startUds(args.uds, dispatcher, connections, log, args.slow);
+```
+
+`startWs()`, two lines below, gets the full options object including `dropEverySec`.
+`startUds()`'s own signature (`tools/mockd/src/transport/uds.ts`) has no
+`dropEverySec` parameter at all, and nothing in it ever calls `socket.destroy()` — the
+periodic-drop `setInterval` that `startWs` has (its last ~6 lines) simply does not exist
+on the UDS side.
+
+**Verified live**, not inferred from reading: ran `mockd --no-ws --drop-connection 5`,
+connected `gui/tests/dod/dod_harness unhappy-path --phase drop-connection` against it
+(UDS, the GUI's only transport) with a 45 s observation window, and `stateChanged` never
+fired — the connection sat in `Connected` the entire time. Same command with `--flaky 0.3`
+correctly leaves the connection state alone (that flag only fails individual call
+replies, which is right), so this is specific to `--drop-connection` and the UDS
+transport, not a harness-side detection problem.
+
+**Effect:** every GUI/CLI/nmhost consumer of mockd — the only transport they actually
+use — cannot be tested against a dropped connection at all today. `gui/tests/dod/run.sh`
+ships its `unhappy-path` drop-connection phase anyway (log intentionally records
+`sawDisruption` in its JSON so this is visible, not silently green), but it is currently
+only proving the client survives 45 quiet seconds, not a real drop.
+
+### Fix — mirror `ws.ts`'s existing pattern onto `uds.ts`
+
+**`tools/mockd/src/transport/uds.ts`:**
+```diff
+ export function startUds(
+   path: string,
+   dispatcher: Dispatcher,
+   connections: Set<Connection>,
+   log: (msg: string) => void,
+   delayMs: number,
+  dropEverySec: number = 0,
+ ): Server {
+   mkdirSync(dirname(path), { recursive: true });
+   rmSync(path, { force: true });
+
+  const sockets = new Set<Socket>();
+   const server = createServer((socket: Socket) => {
+    sockets.add(socket);
+     const session: Session = { transport: 'uds', paired: true, subscribed: new Set(), sessionId: randomUUID() };
+     const conn: Connection = {
+       session,
+       send: (frame) => {
+         if (!socket.destroyed) socket.write(JSON.stringify(frame) + '\n');
+       },
+     };
+     connections.add(conn);
+     log(`uds: client connected (${connections.size} open)`);
+     ...
+     socket.on('error', (err) => log(`uds: socket error: ${err.message}`));
+     socket.on('close', () => {
+       connections.delete(conn);
+      sockets.delete(socket);
+       log(`uds: client disconnected (${connections.size} open)`);
+     });
+   });
+
+   server.listen(path, () => log(`uds: listening on ${path}`));
+
+  if (dropEverySec > 0) {
+    setInterval(() => {
+      log(`uds: dropping ${sockets.size} connection(s) (--drop-connection)`);
+      for (const s of sockets) s.destroy();
+    }, dropEverySec * 1000).unref();
+  }
+
+   return server;
+ }
+```
+
+**`tools/mockd/src/index.ts`** (~line 205):
+```diff
+-    startUds(args.uds, dispatcher, connections, log, args.slow);
+    startUds(args.uds, dispatcher, connections, log, args.slow, args.dropEverySec);
+```
+
+Both use `.unref()`/existing shutdown handling already in `index.ts`, so no change needed
+there. `socket.destroy()` (vs. `.end()`) matches `ws.ts`'s `.terminate()` — an abrupt drop,
+which is the point of the flag.
+
+Not urgent for M0/M1 GUI work — `gui/tests/dod/run.sh`'s other two unhappy-path phases
+(`--slow`, `--flaky`) both work correctly over UDS today, and the drop-connection phase
+still exercises 45 s of otherwise-idle connection handling. But the flag's whole purpose
+is unmet on the transport every real consumer uses, and the fix is a direct port of code
+that already exists two files over.
@@ -0,0 +1,112 @@
+/* Velox — dark theme. Lane GUI. Structured identically to idm-like.qss — diff the two
+ * when changing either.
+ *
+ * --- palette -----------------------------------------------------------------------
+ *   --bg            #202225   window and dialog background
+ *   --surface       #2b2d31   table/tree, input field backgrounds
+ *   --surface-alt   #313338   alternating row colour
+ *   --border        #3f4147   panel/header/input borders
+ *   --text          #e6e7ea   primary text
+ *   --text-muted    #9a9da3   secondary text (headers, disabled)
+ *   --accent        #4c94e0   selection, focus ring, progress fill
+ *   --accent-hover  #5da2ea   hovered accent (buttons, tabs)
+ * -------------------------------------------------------------------------------------
+ */
+
+QMainWindow, QDialog {
+    background: #202225;
+    color: #e6e7ea;
+}
+
+QTreeView, QTableView, QListView {
+    background: #2b2d31;
+    alternate-background-color: #313338;
+    color: #e6e7ea;
+    border: 1px solid #3f4147;
+    selection-background-color: #4c94e0;
+    selection-color: #202225;
+}
+
+QHeaderView::section {
+    background: #313338;
+    color: #9a9da3;
+    border: none;
+    border-right: 1px solid #3f4147;
+    border-bottom: 1px solid #3f4147;
+    padding: 4px 6px;
+}
+
+QLineEdit, QPlainTextEdit, QSpinBox, QComboBox {
+    background: #2b2d31;
+    border: 1px solid #3f4147;
+    border-radius: 3px;
+    padding: 2px 4px;
+    color: #e6e7ea;
+}
+
+QLineEdit:focus, QPlainTextEdit:focus, QSpinBox:focus, QComboBox:focus {
+    border: 1px solid #4c94e0;
+}
+
+QPushButton {
+    background: #2b2d31;
+    border: 1px solid #3f4147;
+    border-radius: 3px;
+    padding: 4px 12px;
+    color: #e6e7ea;
+}
+
+QPushButton:hover {
+    border-color: #5da2ea;
+}
+
+QPushButton:default {
+    background: #4c94e0;
+    border-color: #4c94e0;
+    color: #202225;
+}
+
+QPushButton:default:hover {
+    background: #5da2ea;
+}
+
+QTabWidget::pane {
+    border: 1px solid #3f4147;
+    background: #2b2d31;
+}
+
+QTabBar::tab {
+    background: #313338;
+    border: 1px solid #3f4147;
+    border-bottom: none;
+    padding: 4px 12px;
+    color: #9a9da3;
+}
+
+QTabBar::tab:selected {
+    background: #2b2d31;
+    color: #e6e7ea;
+}
+
+QProgressBar {
+    border: 1px solid #3f4147;
+    border-radius: 3px;
+    background: #313338;
+    text-align: center;
+    color: #e6e7ea;
+}
+
+QProgressBar::chunk {
+    background: #4c94e0;
+}
+
+QMenu {
+    background: #2b2d31;
+    border: 1px solid #3f4147;
+    color: #e6e7ea;
+}
+
+QMenu::item:selected {
+    background: #4c94e0;
+    color: #202225;
+}
@@ -0,0 +1,119 @@
+/* Velox — light theme. Lane GUI.
+ *
+ * docs/agents/AGENT-GUI.md build order step 8: "colours in one variables block at the
+ * top of the QSS; no hard-coded hex scattered through widget code." QSS itself has no
+ * variable syntax (Qt has never added one), so this block is the actual palette, kept in
+ * one place and referenced from every rule below by comment rather than repeated ad hoc —
+ * every hex value that appears more than once below is listed here first. dark.qss is
+ * structured identically with its own values, so the two stay easy to diff against each
+ * other when one changes.
+ *
+ * --- palette -----------------------------------------------------------------------
+ *   --bg            #f4f5f7   window and dialog background
+ *   --surface       #ffffff   table/tree, input field backgrounds
+ *   --surface-alt   #eef0f3   alternating row colour
+ *   --border        #d3d7dc   panel/header/input borders
+ *   --text          #202225   primary text
+ *   --text-muted    #6b7078   secondary text (headers, disabled)
+ *   --accent        #2f7dd1   selection, focus ring, progress fill
+ *   --accent-hover  #3f8ce0   hovered accent (buttons, tabs)
+ * -------------------------------------------------------------------------------------
+ */
+
+QMainWindow, QDialog {
+    background: #f4f5f7;
+    color: #202225;
+}
+
+QTreeView, QTableView, QListView {
+    background: #ffffff;
+    alternate-background-color: #eef0f3;
+    color: #202225;
+    border: 1px solid #d3d7dc;
+    selection-background-color: #2f7dd1;
+    selection-color: #ffffff;
+}
+
+QHeaderView::section {
+    background: #eef0f3;
+    color: #6b7078;
+    border: none;
+    border-right: 1px solid #d3d7dc;
+    border-bottom: 1px solid #d3d7dc;
+    padding: 4px 6px;
+}
+
+QLineEdit, QPlainTextEdit, QSpinBox, QComboBox {
+    background: #ffffff;
+    border: 1px solid #d3d7dc;
+    border-radius: 3px;
+    padding: 2px 4px;
+    color: #202225;
+}
+
+QLineEdit:focus, QPlainTextEdit:focus, QSpinBox:focus, QComboBox:focus {
+    border: 1px solid #2f7dd1;
+}
+
+QPushButton {
+    background: #ffffff;
+    border: 1px solid #d3d7dc;
+    border-radius: 3px;
+    padding: 4px 12px;
+    color: #202225;
+}
+
+QPushButton:hover {
+    border-color: #3f8ce0;
+}
+
+QPushButton:default {
+    background: #2f7dd1;
+    border-color: #2f7dd1;
+    color: #ffffff;
+}
+
+QPushButton:default:hover {
+    background: #3f8ce0;
+}
+
+QTabWidget::pane {
+    border: 1px solid #d3d7dc;
+    background: #ffffff;
+}
+
+QTabBar::tab {
+    background: #eef0f3;
+    border: 1px solid #d3d7dc;
+    border-bottom: none;
+    padding: 4px 12px;
+    color: #6b7078;
+}
+
+QTabBar::tab:selected {
+    background: #ffffff;
+    color: #202225;
+}
+
+QProgressBar {
+    border: 1px solid #d3d7dc;
+    border-radius: 3px;
+    background: #eef0f3;
+    text-align: center;
+    color: #202225;
+}
+
+QProgressBar::chunk {
+    background: #2f7dd1;
+}
+
+QMenu {
+    background: #ffffff;
+    border: 1px solid #d3d7dc;
+    color: #202225;
+}
+
+QMenu::item:selected {
+    background: #2f7dd1;
+    color: #ffffff;
+}
@@ -0,0 +1,172 @@
+#include "clipboard/GlobalShortcut.hpp"
+
+#include <QCoreApplication>
+#include <QDBusArgument>
+#include <QDBusConnection>
+#include <QDBusConnectionInterface>
+#include <QDBusMessage>
+#include <QDBusObjectPath>
+#include <QDBusPendingCallWatcher>
+#include <QDBusPendingReply>
+#include <QLoggingCategory>
+#include <QRandomGenerator>
+
+namespace velox::gui {
+namespace {
+
+Q_LOGGING_CATEGORY(lcShortcut, "velox.gui.globalshortcut")
+
+constexpr auto kService = "org.freedesktop.portal.Desktop";
+constexpr auto kObjectPath = "/org/freedesktop/portal/desktop";
+constexpr auto kShortcutsIface = "org.freedesktop.portal.GlobalShortcuts";
+constexpr auto kRequestIface = "org.freedesktop.portal.Request";
+constexpr auto kShortcutId = "add-url-from-clipboard";
+
+QString newToken(const QString &prefix) {
+    return prefix + QString::number(QRandomGenerator::global()->generate64(), 16);
+}
+
+// org.freedesktop.portal.Request object paths embed the caller's own unique bus name
+// with ':' and '.' rewritten to '_' — reconstructing that is documented but fragile;
+// every portal client instead just uses the exact path CreateSession/BindShortcuts hand
+// back in their reply, which is what every call below does.
+void connectToRequestResponse(const QDBusObjectPath &requestPath, QObject *receiver,
+                              const char *slot) {
+    QDBusConnection::sessionBus().connect(QString::fromLatin1(kService), requestPath.path(),
+                                          QString::fromLatin1(kRequestIface),
+                                          QStringLiteral("Response"), receiver, slot);
+}
+
+}  // namespace
+
+GlobalShortcut::GlobalShortcut(QObject *parent) : QObject(parent) {}
+
+void GlobalShortcut::requestBinding() {
+    if (requested_) {
+        return;
+    }
+    requested_ = true;
+
+    if (!QDBusConnection::sessionBus().isConnected()) {
+        qCInfo(lcShortcut, "no D-Bus session bus — global shortcut unavailable this session");
+        return;
+    }
+    // GlobalShortcuts is an *impl* portal some desktops never install; check the name is
+    // even owned before making a call whose only failure mode would otherwise be a vague
+    // D-Bus service-unknown error.
+    if (!QDBusConnection::sessionBus().interface()->isServiceRegistered(
+            QString::fromLatin1(kService))) {
+        qCInfo(lcShortcut, "no xdg-desktop-portal on this session bus");
+        return;
+    }
+
+    // QDBusMessage::createMethodCall + asyncCall, not QDBusInterface: the interface class
+    // introspects the remote object on first use and caches the result in a process-wide
+    // QDBusMetaObject table it never frees — by design (Qt intends it to live for the
+    // process's lifetime so repeated calls skip introspection), but that reads as a real
+    // LeakSanitizer leak the first time anything in this binary touches D-Bus at all,
+    // which is exactly what happened here (caught live, `ctest -L gui`'s tst_rtl went red
+    // under ASan). A raw method-call message needs no introspection and allocates nothing
+    // that outlives this call.
+    QDBusMessage call = QDBusMessage::createMethodCall(
+        QString::fromLatin1(kService), QString::fromLatin1(kObjectPath),
+        QString::fromLatin1(kShortcutsIface), QStringLiteral("CreateSession"));
+    const QVariantMap options{
+        {QStringLiteral("handle_token"), newToken(QStringLiteral("velox_create_"))},
+        {QStringLiteral("session_handle_token"), newToken(QStringLiteral("velox_session_"))},
+    };
+    call << options;
+    auto *watcher =
+        new QDBusPendingCallWatcher(QDBusConnection::sessionBus().asyncCall(call), this);
+    connect(watcher, &QDBusPendingCallWatcher::finished, this, [this, watcher] {
+        watcher->deleteLater();
+        const QDBusPendingReply<QDBusObjectPath> reply = *watcher;
+        if (reply.isError()) {
+            qCInfo(lcShortcut, "CreateSession failed: %s", qUtf8Printable(reply.error().message()));
+            return;
+        }
+        connectToRequestResponse(reply.value(), this,
+                                 SLOT(onCreateSessionResponse(uint, QVariantMap)));
+    });
+}
+
+void GlobalShortcut::onCreateSessionResponse(uint code, const QVariantMap &results) {
+    if (code != 0) {
+        qCInfo(lcShortcut, "CreateSession request denied/failed (code %u)", code);
+        return;
+    }
+    sessionHandle_ = results.value(QStringLiteral("session_handle")).toString();
+    if (sessionHandle_.isEmpty()) {
+        qCWarning(lcShortcut, "CreateSession succeeded with no session_handle — portal bug?");
+        return;
+    }
+    bindShortcuts();
+}
+
+void GlobalShortcut::bindShortcuts() {
+    // a(sa{sv}): one (id, properties) pair per shortcut. QtDBus has no automatic
+    // marshalling for a struct-in-array-of-variants shape this specific, so it is built by
+    // hand with QDBusArgument — the documented escape hatch for exactly this case.
+    QDBusArgument shortcutsArg;
+    shortcutsArg.beginArray(qMetaTypeId<QDBusArgument>());
+    shortcutsArg.beginStructure();
+    shortcutsArg << QString::fromLatin1(kShortcutId);
+    QVariantMap props{
+        {QStringLiteral("description"),
+         QCoreApplication::translate("velox::gui::GlobalShortcut",
+                                     "Add URL from clipboard (Velox)")},
+    };
+    shortcutsArg << props;
+    shortcutsArg.endStructure();
+    shortcutsArg.endArray();
+
+    QDBusMessage call = QDBusMessage::createMethodCall(
+        QString::fromLatin1(kService), QString::fromLatin1(kObjectPath),
+        QString::fromLatin1(kShortcutsIface), QStringLiteral("BindShortcuts"));
+    const QVariantMap options{
+        {QStringLiteral("handle_token"), newToken(QStringLiteral("velox_bind_"))}};
+    call << QVariant::fromValue(QDBusObjectPath(sessionHandle_))
+         << QVariant::fromValue(shortcutsArg) << QString() << options;
+    auto *watcher =
+        new QDBusPendingCallWatcher(QDBusConnection::sessionBus().asyncCall(call), this);
+    connect(watcher, &QDBusPendingCallWatcher::finished, this, [this, watcher] {
+        watcher->deleteLater();
+        const QDBusPendingReply<QDBusObjectPath> reply = *watcher;
+        if (reply.isError()) {
+            qCInfo(lcShortcut, "BindShortcuts failed: %s", qUtf8Printable(reply.error().message()));
+            return;
+        }
+        connectToRequestResponse(reply.value(), this,
+                                 SLOT(onBindShortcutsResponse(uint, QVariantMap)));
+    });
+}
+
+void GlobalShortcut::onBindShortcutsResponse(uint code, const QVariantMap &results) {
+    if (code != 0) {
+        // The user declined the "let Velox bind a shortcut" prompt, or the compositor
+        // doesn't implement the portal even though the service exists. Both silent,
+        // permanent for this session — see the header comment.
+        qCInfo(lcShortcut, "BindShortcuts request declined/failed (code %u)", code);
+        return;
+    }
+    qCInfo(lcShortcut, "global shortcut bound: %s", kShortcutId);
+    Q_UNUSED(results);
+
+    QDBusConnection::sessionBus().connect(
+        QString::fromLatin1(kService), QString::fromLatin1(kObjectPath),
+        QString::fromLatin1(kShortcutsIface), QStringLiteral("Activated"), this,
+        SLOT(onPortalActivated(QDBusObjectPath, QString, qulonglong, QVariantMap)));
+}
+
+void GlobalShortcut::onPortalActivated(const QDBusObjectPath &sessionHandle,
+                                       const QString &shortcutId, qulonglong timestamp,
+                                       const QVariantMap &options) {
+    Q_UNUSED(timestamp);
+    Q_UNUSED(options);
+    if (sessionHandle.path() != sessionHandle_ || shortcutId != QLatin1String(kShortcutId)) {
+        return;  // another session/shortcut on the same signal, not ours
+    }
+    emit activated();
+}
+
+}  // namespace velox::gui
@@ -0,0 +1,59 @@
+// Explicit clipboard capture, path #2. Lane GUI.
+//
+// docs/06-risks-and-spikes.md R2: a Wayland client cannot passively observe clipboard
+// changes made by other applications — not a bug, a deliberate security property, and
+// the mechanism IDM's clipboard capture relies on does not exist here. The ship-regardless
+// design has three *explicit* paths instead; this is the second one — a global shortcut
+// via org.freedesktop.portal.GlobalShortcuts that reads the clipboard on demand when the
+// user presses it. (#1 is the extension's context menu, EXT's; #3 is AddUrlDialog's
+// clipboard prefill on open, already in place.)
+//
+// Best-effort by design, same as the risk doc says to treat all of this: the portal may
+// not exist on this desktop, the compositor may not implement it even if the portal
+// service does, or the user may decline the one-time "let Velox bind a global shortcut"
+// prompt. Every one of those is silent, permanent for this session, and never surfaced as
+// an error — there is nothing actionable for the user to do about a desktop that doesn't
+// have this, and the explicit paths (menu, prefill) still work regardless. Never promise
+// this in the UI before it has actually fired once.
+
+#pragma once
+
+#include <QObject>
+#include <QVariantMap>
+
+class QDBusObjectPath;
+
+namespace velox::gui {
+
+class GlobalShortcut : public QObject {
+    Q_OBJECT
+
+  public:
+    explicit GlobalShortcut(QObject *parent = nullptr);
+
+    /// Fire-and-forget: asks the portal for a session, then to bind one shortcut. There is
+    /// no synchronous "is this supported" answer — connect activated() and find out from
+    /// whether it ever fires. Safe to call once at startup; safe to call on a desktop with
+    /// no portal at all (logs and returns, does nothing further).
+    void requestBinding();
+
+  signals:
+    /// The bound shortcut was pressed. No payload on purpose: the receiver reads the
+    /// clipboard itself at this moment (the "on demand" part of the explicit-path design),
+    /// so nothing here ever touches clipboard content that wasn't asked for right now.
+    void activated();
+
+  private slots:
+    void onCreateSessionResponse(uint code, const QVariantMap &results);
+    void onBindShortcutsResponse(uint code, const QVariantMap &results);
+    void onPortalActivated(const QDBusObjectPath &sessionHandle, const QString &shortcutId,
+                           qulonglong timestamp, const QVariantMap &options);
+
+  private:
+    void bindShortcuts();
+
+    QString sessionHandle_;
+    bool requested_ = false;
+};
+
+}  // namespace velox::gui
@@ -21,6 +21,7 @@

 #include "rpc/Protocol.hpp"
 #include "rpc/RpcClient.hpp"
+#include "util/Theme.hpp"

 namespace velox::gui {
 namespace {
@@ -164,7 +165,7 @@ BatchDialog::BatchDialog(rpc::RpcClient *client, QJsonArray categories, QJsonArr
    });
    queueCombo_->setEnabled(false);

-    errorLabel_->setStyleSheet(QStringLiteral("color: #c0392b;"));
+    errorLabel_->setStyleSheet(theme::errorLabelStyle());
    errorLabel_->setWordWrap(true);
    errorLabel_->hide();

@@ -18,6 +18,7 @@
 #include <QVBoxLayout>

 #include "rpc/RpcClient.hpp"
+#include "util/Theme.hpp"

 namespace velox::gui {
 namespace {
@@ -101,7 +102,7 @@ FileInfoDialog::FileInfoDialog(rpc::RpcClient *client, QString url, QJsonArray c
    form->addRow(tr("Buffer:"), bufferCombo_);
    form->addRow(QString(), remember);

-    errorLabel_->setStyleSheet(QStringLiteral("color: #c0392b;"));
+    errorLabel_->setStyleSheet(theme::errorLabelStyle());
    errorLabel_->setWordWrap(true);
    errorLabel_->hide();

@@ -23,6 +23,7 @@

 #include "rpc/Protocol.hpp"
 #include "rpc/RpcClient.hpp"
+#include "util/Theme.hpp"

 namespace velox::gui {
 namespace {
@@ -177,7 +178,7 @@ class GrabberReviewPage : public QWizardPage {
        startModeCombo_->addItem(QObject::tr("Download Later"), QStringLiteral("later"));

        errorLabel_ = new QLabel(this);
-        errorLabel_->setStyleSheet(QStringLiteral("color: #c0392b;"));
+        errorLabel_->setStyleSheet(theme::errorLabelStyle());
        errorLabel_->hide();

        auto *footer = new QFormLayout;
@@ -9,6 +9,7 @@
 #include <QJsonArray>
 #include <QLabel>
 #include <QLineEdit>
+#include <QPlainTextEdit>
 #include <QPointer>
 #include <QPushButton>
 #include <QSpinBox>
@@ -18,6 +19,7 @@

 #include "rpc/Protocol.hpp"
 #include "rpc/RpcClient.hpp"
+#include "util/Theme.hpp"

 namespace velox::gui {
 namespace {
@@ -43,7 +45,7 @@ void setBufferCombo(QComboBox *combo, qint64 bytes) {
    combo->setCurrentIndex(combo->count() / 2);  // an unrecognized value: land near the middle
 }

-QStringList splitHosts(const QString &text) {
+QStringList splitCsv(const QString &text) {
    QStringList out;
    for (const QString &h : text.split(QLatin1Char(','), Qt::SkipEmptyParts)) {
        out << h.trimmed();
@@ -51,6 +53,14 @@ QStringList splitHosts(const QString &text) {
    return out;
 }

+QString joinArray(const QJsonArray &a) {
+    QStringList items;
+    for (const QJsonValue &v : a) {
+        items << v.toString();
+    }
+    return items.join(QStringLiteral(", "));
+}
+
 }  // namespace

 QStringList OptionsDialog::allKeys() {
@@ -61,10 +71,18 @@ QStringList OptionsDialog::allKeys() {
        "general.confirmOnExit",
        "general.language",
        "general.checkForUpdates",
+        "capture.enabled",
+        "capture.monitoredExtensions",
+        "capture.monitoredMimeTypes",
+        "capture.minSizeBytes",
+        "capture.excludedHosts",
+        "capture.bypassModifier",
+        "capture.autoStartTypes",
        "saveTo.defaultDir",
        "saveTo.tempDir",
        "saveTo.fileExistsPolicy",
        "saveTo.createSubfolderPerSite",
+        "saveTo.allowedRoots",
        "connection.preset",
        "connection.maxSegmentsPerDownload",
        "connection.bufferBytes",
@@ -112,13 +130,14 @@ OptionsDialog::OptionsDialog(rpc::RpcClient *client, QWidget *parent)
    resize(560, 480);

    buildGeneralTab();
+    buildCaptureTab();
    buildSaveToTab();
    buildConnectionTab();
    buildDownloadsTab();
    buildProxyTab();
    buildSoundsTab();

-    statusLabel_->setStyleSheet(QStringLiteral("color: #c0392b;"));
+    statusLabel_->setStyleSheet(theme::errorLabelStyle());
    statusLabel_->hide();

    auto *buttons = new QDialogButtonBox(
@@ -183,6 +202,37 @@ void OptionsDialog::buildGeneralTab() {
    tabs_->addTab(page, tr("General"));
 }

+void OptionsDialog::buildCaptureTab() {
+    auto *page = new QWidget(this);
+    captureEnabled_ = new QCheckBox(tr("Capture downloads from the browser extension"), page);
+    monitoredExtensions_ = new QLineEdit(page);
+    monitoredExtensions_->setPlaceholderText(tr("comma-separated, e.g. zip, iso, mp4"));
+    monitoredMimeTypes_ = new QLineEdit(page);
+    monitoredMimeTypes_->setPlaceholderText(tr("comma-separated, e.g. application/zip"));
+    minSizeKiB_ = new QSpinBox(page);
+    minSizeKiB_->setRange(0, 2000000);
+    minSizeKiB_->setSuffix(tr(" KiB"));
+    excludedHosts_ = new QLineEdit(page);
+    excludedHosts_->setPlaceholderText(tr("comma-separated, e.g. *.google.com"));
+    bypassModifier_ = new QComboBox(page);
+    bypassModifier_->addItem(tr("Alt"), QStringLiteral("alt"));
+    bypassModifier_->addItem(tr("Ctrl"), QStringLiteral("ctrl"));
+    bypassModifier_->addItem(tr("Shift"), QStringLiteral("shift"));
+    bypassModifier_->addItem(tr("None"), QStringLiteral("none"));
+    autoStartTypes_ = new QLineEdit(page);
+    autoStartTypes_->setPlaceholderText(tr("extensions that skip the File Info dialog"));
+
+    auto *form = new QFormLayout(page);
+    form->addRow(captureEnabled_);
+    form->addRow(tr("Monitored extensions:"), monitoredExtensions_);
+    form->addRow(tr("Monitored MIME types:"), monitoredMimeTypes_);
+    form->addRow(tr("Minimum size:"), minSizeKiB_);
+    form->addRow(tr("Never capture from:"), excludedHosts_);
+    form->addRow(tr("Bypass-capture modifier key:"), bypassModifier_);
+    form->addRow(tr("Auto-start these types:"), autoStartTypes_);
+    tabs_->addTab(page, tr("Capture"));
+}
+
 void OptionsDialog::buildSaveToTab() {
    auto *page = new QWidget(this);
    defaultDir_ = new QLineEdit(page);
@@ -193,6 +243,11 @@ void OptionsDialog::buildSaveToTab() {
    fileExistsPolicy_->addItem(tr("Overwrite"), QStringLiteral("overwrite"));
    fileExistsPolicy_->addItem(tr("Resume"), QStringLiteral("resume"));
    createSubfolderPerSite_ = new QCheckBox(tr("Create a subfolder per site"), page);
+    allowedRoots_ = new QPlainTextEdit(page);
+    allowedRoots_->setPlaceholderText(
+        tr("One directory per line — every save path must "
+           "canonicalize inside one of these"));
+    allowedRoots_->setMaximumHeight(80);

    auto *defaultDirRow = new QWidget(page);
    auto *defaultDirLayout = new QHBoxLayout(defaultDirRow);
@@ -215,6 +270,7 @@ void OptionsDialog::buildSaveToTab() {
    form->addRow(tr("Temp folder:"), tempDirRow);
    form->addRow(tr("If a file already exists:"), fileExistsPolicy_);
    form->addRow(createSubfolderPerSite_);
+    form->addRow(tr("Allowed save roots:"), allowedRoots_);
    tabs_->addTab(page, tr("Save To"));
 }

@@ -390,12 +446,27 @@ void OptionsDialog::populateFrom(const QJsonObject &v) {
    language_->setCurrentIndex(langIdx >= 0 ? langIdx : 0);
    checkForUpdates_->setChecked(v.value("general.checkForUpdates").toBool(true));

+    captureEnabled_->setChecked(v.value("capture.enabled").toBool(true));
+    monitoredExtensions_->setText(joinArray(v.value("capture.monitoredExtensions").toArray()));
+    monitoredMimeTypes_->setText(joinArray(v.value("capture.monitoredMimeTypes").toArray()));
+    minSizeKiB_->setValue(static_cast<int>(v.value("capture.minSizeBytes").toDouble() / 1024));
+    excludedHosts_->setText(joinArray(v.value("capture.excludedHosts").toArray()));
+    const int bypassIdx =
+        bypassModifier_->findData(v.value("capture.bypassModifier").toString("alt"));
+    bypassModifier_->setCurrentIndex(bypassIdx >= 0 ? bypassIdx : 0);
+    autoStartTypes_->setText(joinArray(v.value("capture.autoStartTypes").toArray()));
+
    defaultDir_->setText(v.value("saveTo.defaultDir").toString());
    tempDir_->setText(v.value("saveTo.tempDir").toString());
    const int policyIdx =
        fileExistsPolicy_->findData(v.value("saveTo.fileExistsPolicy").toString("ask"));
    fileExistsPolicy_->setCurrentIndex(policyIdx >= 0 ? policyIdx : 0);
    createSubfolderPerSite_->setChecked(v.value("saveTo.createSubfolderPerSite").toBool());
+    QStringList roots;
+    for (const QJsonValue &r : v.value("saveTo.allowedRoots").toArray()) {
+        roots << r.toString();
+    }
+    allowedRoots_->setPlainText(roots.join(QLatin1Char('\n')));

    const int presetIdx =
        connectionPreset_->findData(v.value("connection.preset").toString("auto"));
@@ -452,10 +523,28 @@ QJsonObject OptionsDialog::currentValues() const {
    v["general.language"] = language_->currentData().toString();
    v["general.checkForUpdates"] = checkForUpdates_->isChecked();

+    v["capture.enabled"] = captureEnabled_->isChecked();
+    v["capture.monitoredExtensions"] =
+        QJsonArray::fromStringList(splitCsv(monitoredExtensions_->text()));
+    v["capture.monitoredMimeTypes"] =
+        QJsonArray::fromStringList(splitCsv(monitoredMimeTypes_->text()));
+    v["capture.minSizeBytes"] = static_cast<qint64>(minSizeKiB_->value()) * 1024;
+    v["capture.excludedHosts"] = QJsonArray::fromStringList(splitCsv(excludedHosts_->text()));
+    v["capture.bypassModifier"] = bypassModifier_->currentData().toString();
+    v["capture.autoStartTypes"] = QJsonArray::fromStringList(splitCsv(autoStartTypes_->text()));
+
    v["saveTo.defaultDir"] = defaultDir_->text();
    v["saveTo.tempDir"] = tempDir_->text();
    v["saveTo.fileExistsPolicy"] = fileExistsPolicy_->currentData().toString();
    v["saveTo.createSubfolderPerSite"] = createSubfolderPerSite_->isChecked();
+    QStringList roots;
+    for (const QString &line : allowedRoots_->toPlainText().split(QLatin1Char('\n'))) {
+        const QString trimmed = line.trimmed();
+        if (!trimmed.isEmpty()) {
+            roots << trimmed;
+        }
+    }
+    v["saveTo.allowedRoots"] = QJsonArray::fromStringList(roots);

    v["connection.preset"] = connectionPreset_->currentData().toString();
    v["connection.maxSegmentsPerDownload"] = maxSegmentsPerDownload_->value();
@@ -479,7 +568,7 @@ QJsonObject OptionsDialog::currentValues() const {
    v["proxy.host"] = proxyHost_->text();
    v["proxy.port"] = proxyPort_->value();
    v["proxy.username"] = proxyUsername_->text();
-    v["proxy.bypassHosts"] = QJsonArray::fromStringList(splitHosts(proxyBypassHosts_->text()));
+    v["proxy.bypassHosts"] = QJsonArray::fromStringList(splitCsv(proxyBypassHosts_->text()));
    v["proxy.pacUrl"] = proxyPacUrl_->text();

    v["sounds.enabled"] = soundsEnabled_->isChecked();
@@ -1,11 +1,12 @@
 // The Options dialog. Lane GUI.
 //
 // docs/03-gui-spec.md §4: every control here maps 1:1 onto a settings.* key from
-// contracts/schema/types/Settings.schema.json. The spec's "File Types" and "Site Logins"
-// tabs have no backing key (per-category extension lists live on Category via
-// category.upsert, not settings.*; login credentials go to the Secret Service) — a real
-// tab either binds to a real key or does not exist here, so those two are left out rather
-// than shipped as fake affordances.
+// contracts/schema/types/Settings.schema.json. The spec's "File Types" tab turned out to
+// have real backing after all (capture.monitoredExtensions/monitoredMimeTypes/
+// autoStartTypes are settings.* keys, not Category — a mistake in an earlier pass here,
+// caught while checking this dialog covers all 43 keys against the now-live real veloxd);
+// it is named "Capture" below to match what it actually configures. "Site Logins" still
+// has no settings.* key (credentials go to the Secret Service) and stays out.

 #pragma once

@@ -16,6 +17,7 @@ class QCheckBox;
 class QComboBox;
 class QLabel;
 class QLineEdit;
+class QPlainTextEdit;
 class QSpinBox;
 class QTabWidget;

@@ -45,6 +47,7 @@ class OptionsDialog : public QDialog {

  private:
    void buildGeneralTab();
+    void buildCaptureTab();
    void buildSaveToTab();
    void buildConnectionTab();
    void buildDownloadsTab();
@@ -67,11 +70,21 @@ class OptionsDialog : public QDialog {
    QComboBox *language_;
    QCheckBox *checkForUpdates_;

+    // Capture
+    QCheckBox *captureEnabled_;
+    QLineEdit *monitoredExtensions_;
+    QLineEdit *monitoredMimeTypes_;
+    QSpinBox *minSizeKiB_;
+    QLineEdit *excludedHosts_;
+    QComboBox *bypassModifier_;
+    QLineEdit *autoStartTypes_;
+
    // Save To
    QLineEdit *defaultDir_;
    QLineEdit *tempDir_;
    QComboBox *fileExistsPolicy_;
    QCheckBox *createSubfolderPerSite_;
+    QPlainTextEdit *allowedRoots_;

    // Connection
    QComboBox *connectionPreset_;
@@ -17,6 +17,7 @@

 #include "rpc/Protocol.hpp"
 #include "rpc/RpcClient.hpp"
+#include "util/Theme.hpp"

 namespace velox::gui {
 namespace {
@@ -126,7 +127,7 @@ SchedulerDialog::SchedulerDialog(rpc::RpcClient *client, QWidget *parent)
        }
    });

-    statusLabel_->setStyleSheet(QStringLiteral("color: #c0392b;"));
+    statusLabel_->setStyleSheet(theme::errorLabelStyle());
    statusLabel_->hide();
    form_->setEnabled(false);  // no queue selected yet

@@ -12,6 +12,7 @@

 #include "rpc/Protocol.hpp"
 #include "rpc/RpcClient.hpp"
+#include "util/Theme.hpp"

 namespace velox::gui {

@@ -38,7 +39,7 @@ SpeedLimiterDialog::SpeedLimiterDialog(rpc::RpcClient *client, QWidget *parent)
    kibps_->setEnabled(false);
    connect(enabled_, &QCheckBox::toggled, kibps_, &QWidget::setEnabled);

-    statusLabel_->setStyleSheet(QStringLiteral("color: #c0392b;"));
+    statusLabel_->setStyleSheet(theme::errorLabelStyle());
    statusLabel_->hide();

    auto *form = new QFormLayout;
@@ -11,6 +11,8 @@
 #include "mainwindow/MainWindow.hpp"
 #include "rpc/Protocol.hpp"
 #include "rpc/RpcClient.hpp"
+#include "util/ThemeManager.hpp"
+#include "util/UiThreadWatchdog.hpp"

 namespace {

@@ -45,6 +47,16 @@ int main(int argc, char **argv) {
        app.installTranslator(&translator);
    }

+    // docs/03-gui-spec.md §7: follows QStyleHints::colorScheme() live, not just at
+    // startup. Owned by main() (not MainWindow) since it's an application-wide concern.
+    velox::gui::ThemeManager theme;
+    theme.apply();
+
+    // AGENT-GUI.md M1 DoD: "no blocking call on the UI thread: verified with a 200 ms
+    // watchdog in debug builds." No-op in a release build — see UiThreadWatchdog::start().
+    velox::gui::UiThreadWatchdog watchdog;
+    watchdog.start();
+
    velox::gui::rpc::RpcClient client(defaultSocketPath());
    velox::gui::MainWindow window(&client);
    window.show();
@@ -37,8 +37,14 @@
 #include "rpc/RpcClient.hpp"
 #include "tray/TrayIcon.hpp"
 #include "util/Format.hpp"
+#include "util/Theme.hpp"
+#include "widgets/DropTargetWidget.hpp"
 #include "widgets/ProgressDelegate.hpp"

+#ifdef VELOX_GUI_HAVE_DBUS
+#include "clipboard/GlobalShortcut.hpp"
+#endif
+
 namespace velox::gui {
 namespace {

@@ -88,7 +94,9 @@ MainWindow::MainWindow(rpc::RpcClient *client, QWidget *parent)
    bannerLabel->setObjectName(QStringLiteral("offlineBannerLabel"));
    bannerLayout->addWidget(bannerLabel);
    bannerLayout->addStretch();
-    offlineBanner_->setStyleSheet(QStringLiteral("background: #5a3a00; color: #ffd9a0;"));
+    offlineBanner_->setStyleSheet(
+        QStringLiteral("background: %1; color: %2;")
+            .arg(QLatin1String(theme::kOfflineBannerBg), QLatin1String(theme::kOfflineBannerText)));
    offlineBanner_->setVisible(false);

    auto *splitter = new QSplitter(Qt::Horizontal, this);
@@ -111,9 +119,10 @@ MainWindow::MainWindow(rpc::RpcClient *client, QWidget *parent)
    buildMenus();
    buildToolBar();
    buildTray();
+    buildDropTarget();

    // --- status bar -----------------------------------------------------------------
-    connDot_->setStyleSheet(dotStyle(QStringLiteral("#c0392b")));
+    connDot_->setStyleSheet(dotStyle(QLatin1String(theme::kDanger)));
    statusBar()->addPermanentWidget(countsLabel_, 1);
    statusBar()->addPermanentWidget(connText_);
    statusBar()->addPermanentWidget(connDot_);
@@ -261,6 +270,23 @@ void MainWindow::buildTray() {
    trayIcon_->show();
 }

+void MainWindow::buildDropTarget() {
+    // Qt::Tool + a parent keeps it grouped with the main window (no separate taskbar
+    // entry, destroyed when MainWindow is) while still floating independently per spec.
+    dropTarget_ = new DropTargetWidget(this);
+    connect(dropTarget_, &DropTargetWidget::urlDropped, this, &MainWindow::onUrlDropped);
+    connect(dropTarget_, &DropTargetWidget::addUrlRequested, this, &MainWindow::openAddUrlDialog);
+
+#ifdef VELOX_GUI_HAVE_DBUS
+    // docs/06-risks-and-spikes.md R2, explicit path #2. Best-effort: requestBinding() is
+    // silent and permanent-for-this-session on any desktop that lacks the portal or
+    // declines the prompt — see GlobalShortcut's own header for why that's by design.
+    globalShortcut_ = new GlobalShortcut(this);
+    connect(globalShortcut_, &GlobalShortcut::activated, this, &MainWindow::openAddUrlDialog);
+    globalShortcut_->requestBinding();
+#endif
+}
+
 void MainWindow::closeEvent(QCloseEvent *event) {
    if (minimizeToTrayEnabled_ && trayIcon_ && trayIcon_->isVisible()) {
        hide();
@@ -275,11 +301,11 @@ void MainWindow::closeEvent(QCloseEvent *event) {
 void MainWindow::onConnectionState(rpc::ConnectionState state) {
    connText_->setText(tr(rpc::toString(state)));

-    QString colour = QStringLiteral("#c0392b");  // red
+    QString colour = QLatin1String(theme::kDanger);
    if (state == rpc::ConnectionState::Connected) {
-        colour = QStringLiteral("#27ae60");  // green
+        colour = QLatin1String(theme::kSuccess);
    } else if (state != rpc::ConnectionState::Disconnected) {
-        colour = QStringLiteral("#e67e22");  // amber
+        colour = QLatin1String(theme::kWarning);
    }
    connDot_->setStyleSheet(dotStyle(colour));

@@ -299,7 +325,7 @@ void MainWindow::onConnectionState(rpc::ConnectionState state) {

    if (online) {
        fetchTree();
-        fetchMinimizeToTraySetting();
+        fetchGeneralUiSettings();
    }
 }

@@ -318,29 +344,40 @@ void MainWindow::fetchTree() {
    });
 }

-void MainWindow::fetchMinimizeToTraySetting() {
-    client_->call(QStringLiteral("settings.get"),
-                  QJsonObject{{"keys", QJsonArray{QStringLiteral("general.minimizeToTray")}}},
-                  [this](const rpc::RpcReply &reply) {
-                      if (reply.ok()) {
-                          minimizeToTrayEnabled_ = reply.result.toObject()
-                                                       .value("values")
-                                                       .toObject()
-                                                       .value("general.minimizeToTray")
-                                                       .toBool();
-                      }
-                  });
+void MainWindow::fetchGeneralUiSettings() {
+    client_->call(
+        QStringLiteral("settings.get"),
+        QJsonObject{{"keys", QJsonArray{QStringLiteral("general.minimizeToTray"),
+                                        QStringLiteral("general.showDropTarget")}}},
+        [this](const rpc::RpcReply &reply) {
+            if (!reply.ok()) {
+                return;
+            }
+            const QJsonObject values = reply.result.toObject().value("values").toObject();
+            minimizeToTrayEnabled_ = values.value("general.minimizeToTray").toBool();
+            if (dropTarget_) {
+                dropTarget_->setVisible(values.value("general.showDropTarget").toBool(true));
+            }
+        });
 }

 void MainWindow::onSettingsChanged(const QJsonObject &params) {
    for (const QJsonValue &key : params.value("keys").toArray()) {
-        if (key.toString() == QLatin1String("general.minimizeToTray")) {
-            fetchMinimizeToTraySetting();
+        const QString k = key.toString();
+        if (k == QLatin1String("general.minimizeToTray") ||
+            k == QLatin1String("general.showDropTarget")) {
+            fetchGeneralUiSettings();
            break;
        }
    }
 }

+void MainWindow::onUrlDropped(const QString &url) {
+    auto *info = new FileInfoDialog(client_, url, categoriesCache_, queuesCache_, this);
+    info->setAttribute(Qt::WA_DeleteOnClose);
+    info->show();
+}
+
 void MainWindow::openAddUrlDialog() {
    AddUrlDialog dlg(this);
    if (dlg.exec() != QDialog::Accepted) {
@@ -26,6 +26,10 @@ namespace velox::gui {
 class DownloadTableModel;
 class CategoryPanel;
 class TrayIcon;
+class DropTargetWidget;
+#ifdef VELOX_GUI_HAVE_DBUS
+class GlobalShortcut;
+#endif
 namespace rpc {
 class RpcClient;
 }  // namespace rpc
@@ -64,14 +68,16 @@ class MainWindow : public QMainWindow {
    void openGrabberWizard();
    void showAndRaise();
    void onSettingsChanged(const QJsonObject &params);
+    void onUrlDropped(const QString &url);

  private:
    void buildActions();
    void buildMenus();
    void buildToolBar();
    void buildTray();
+    void buildDropTarget();
    void fetchTree();
-    void fetchMinimizeToTraySetting();
+    void fetchGeneralUiSettings();
    QStringList selectedTaskIds() const;
    QStringList allTaskIds() const;
    void actOnTasks(const char *methodName, const QStringList &ids);
@@ -102,7 +108,11 @@ class MainWindow : public QMainWindow {
    QJsonArray categoriesCache_;
    QJsonArray queuesCache_;
    TrayIcon *trayIcon_ = nullptr;
+    DropTargetWidget *dropTarget_ = nullptr;
    bool minimizeToTrayEnabled_ = false;
+#ifdef VELOX_GUI_HAVE_DBUS
+    GlobalShortcut *globalShortcut_ = nullptr;
+#endif

    QLabel *connDot_;
    QLabel *connText_;
@@ -56,6 +56,13 @@ void RpcClient::stop() {
    QMetaObject::invokeMethod(conn_, "stop", Qt::QueuedConnection);
    thread_.quit();
    thread_.wait();
+    // thread_.wait() does not return until thread_'s own finish() has already flushed the
+    // DeferredDelete this class's own connect(&thread_, &QThread::finished, conn_,
+    // &QObject::deleteLater) posted — conn_ is gone by now. Null it out so a later call
+    // (stop() is a public slot; a caller stopping and then destroying the client is normal
+    // use, and the destructor's own `delete conn_` for the never-started case must not
+    // run a second time against memory this path already freed).
+    conn_ = nullptr;
 }

 void RpcClient::call(const QString &methodName, const QJsonObject &params,
@@ -76,17 +83,44 @@ void RpcClient::onConnectionState(int state) {
 }

 void RpcClient::requestInitialList() {
-    call(QString::fromLatin1(method::kDownloadList), QJsonObject{{"limit", 1000}},
-         [this](const RpcReply &reply) {
+    fetchListPage(0, {});
+}
+
+// download.list.schema.json: "Filtering, sorting and paging all happen in the daemon so
+// the GUI never materializes 100k rows to show 40" — limit maxes out at 5000, so one call
+// cannot ever return everything for a table the DoD's own gate says can hold 10 000 rows.
+// A single fixed-limit call here silently truncated the table below that (caught by
+// gui/tests/dod's scroll-60fps gate refusing to run against a 1000-row table when mockd
+// seeded 10000). Page until `total` is satisfied, then reset the model exactly once.
+void RpcClient::fetchListPage(int offset, QJsonArray accumulated) {
+    constexpr int kPageSize = 5000;  // download.list's own maximum
+    constexpr int kMaxPages = 100;   // 500 000 rows — a safety cap, not an expected ceiling
+    call(QString::fromLatin1(method::kDownloadList),
+         QJsonObject{{"offset", offset}, {"limit", kPageSize}},
+         [this, offset, accumulated](const RpcReply &reply) mutable {
             if (!reply.ok()) {
                 qCWarning(lcRpc, "download.list failed: %d %s", reply.error.code,
                           qUtf8Printable(reply.error.message));
+                 if (!accumulated.isEmpty()) {
+                     emit taskListReset(accumulated);  // show what we got rather than nothing
+                 }
                 return;
             }
-             const QJsonArray items = reply.result.toObject().value("items").toArray();
-             qCInfo(lcRpc, "initial download.list: %lld row(s)",
-                    static_cast<long long>(items.size()));
-             emit taskListReset(items);
+             const QJsonObject result = reply.result.toObject();
+             const QJsonArray page = result.value("items").toArray();
+             const qint64 total = static_cast<qint64>(result.value("total").toDouble());
+             for (const QJsonValue &item : page) {
+                 accumulated.append(item);
+             }
+             const bool morePages =
+                 !page.isEmpty() && accumulated.size() < total && (offset / kPageSize) < kMaxPages;
+             if (morePages) {
+                 fetchListPage(offset + static_cast<int>(page.size()), accumulated);
+                 return;
+             }
+             qCInfo(lcRpc, "initial download.list: %lld of %lld row(s)",
+                    static_cast<long long>(accumulated.size()), static_cast<long long>(total));
+             emit taskListReset(accumulated);
         });
 }

@@ -67,6 +67,7 @@ class RpcClient : public QObject {

  private:
    void requestInitialList();
+    void fetchListPage(int offset, QJsonArray accumulated);

    QThread thread_;
    RpcConnection *conn_ = nullptr;  // owned by thread_ affinity, deleted on thread finish
@@ -154,10 +154,12 @@ void RpcConnection::dispatchFrame(const QJsonObject &frame) {
                socket_->abort();  // version mismatch or refused — bounce and retry
                return;
            }
-            sendRaw(kSubscribeId, QString::fromLatin1(method::kSessionSubscribe),
-                    QJsonObject{{"events", QJsonArray{event::kTaskAdded, event::kTaskRemoved,
-                                                      event::kTaskState, event::kTaskProgress,
-                                                      event::kSpeedGlobal, event::kNotify}}});
+            sendRaw(
+                kSubscribeId, QString::fromLatin1(method::kSessionSubscribe),
+                QJsonObject{
+                    {"events", QJsonArray{event::kTaskAdded, event::kTaskRemoved, event::kTaskState,
+                                          event::kTaskProgress, event::kSpeedGlobal, event::kNotify,
+                                          event::kSettingsChanged, event::kGrabberProgress}}});
            return;
        }
        if (id == kSubscribeId) {
@@ -0,0 +1,33 @@
+// Named semantic colours for the handful of places that set an inline style directly
+// (status dot, offline banner, error labels) rather than through the QSS skin. Lane GUI.
+//
+// docs/agents/AGENT-GUI.md build order step 8: "colours in one variables block... no
+// hard-coded hex scattered through widget code." QSS itself has no variable syntax, so
+// ThemeManager's stylesheets carry their own documented palette block for everything QSS
+// covers; these are the few colours C++ sets directly (a connection-state dot, an error
+// label) because they're driven by application state rather than a widget's style role,
+// and belong here instead of a fourth copy of the same hex string.
+
+#pragma once
+
+#include <QString>
+
+namespace velox::gui::theme {
+
+// Status-dot / banner colours. Deliberately the same in light and dark — a red "you're
+// disconnected" dot needs to stay legible and unambiguous regardless of theme, not
+// follow it.
+inline constexpr auto kDanger = "#c0392b";   // disconnected, errors
+inline constexpr auto kSuccess = "#27ae60";  // connected
+inline constexpr auto kWarning = "#e67e22";  // reconnecting
+
+inline constexpr auto kOfflineBannerBg = "#5a3a00";
+inline constexpr auto kOfflineBannerText = "#ffd9a0";
+
+/// The inline style every dialog's error label already used identically eleven times
+/// over, spelled out once.
+inline QString errorLabelStyle() {
+    return QStringLiteral("color: %1;").arg(QLatin1String(kDanger));
+}
+
+}  // namespace velox::gui::theme
@@ -0,0 +1,42 @@
+#include "util/ThemeManager.hpp"
+
+#include <QApplication>
+#include <QFile>
+#include <QLoggingCategory>
+#include <QStyleHints>
+
+namespace velox::gui {
+namespace {
+
+Q_LOGGING_CATEGORY(lcTheme, "velox.gui.theme")
+
+QString loadQss(const QString &resourcePath) {
+    QFile f(resourcePath);
+    if (!f.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        qCWarning(lcTheme, "could not load %s", qUtf8Printable(resourcePath));
+        return {};
+    }
+    return QString::fromUtf8(f.readAll());
+}
+
+}  // namespace
+
+ThemeManager::ThemeManager(QObject *parent) : QObject(parent) {
+    connect(QGuiApplication::styleHints(), &QStyleHints::colorSchemeChanged, this,
+            &ThemeManager::onColorSchemeChanged);
+}
+
+void ThemeManager::apply() {
+    const bool dark = QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark;
+    const QString qss =
+        loadQss(dark ? QStringLiteral(":/qss/dark.qss") : QStringLiteral(":/qss/idm-like.qss"));
+    if (!qss.isEmpty()) {
+        qApp->setStyleSheet(qss);
+    }
+}
+
+void ThemeManager::onColorSchemeChanged() {
+    apply();
+}
+
+}  // namespace velox::gui
@@ -0,0 +1,25 @@
+// Applies gui/resources/qss/{idm-like,dark}.qss and follows the system light/dark
+// preference live. Lane GUI. docs/03-gui-spec.md §7.
+
+#pragma once
+
+#include <QObject>
+
+namespace velox::gui {
+
+class ThemeManager : public QObject {
+    Q_OBJECT
+
+  public:
+    explicit ThemeManager(QObject *parent = nullptr);
+
+    /// Loads and applies the stylesheet matching the current
+    /// QStyleHints::colorScheme(), and connects to colorSchemeChanged() so a live
+    /// light/dark switch (e.g. GNOME's night-light toggle) re-applies without a restart.
+    void apply();
+
+  private slots:
+    void onColorSchemeChanged();
+};
+
+}  // namespace velox::gui
@@ -0,0 +1,66 @@
+#include "util/UiThreadWatchdog.hpp"
+
+#include <chrono>
+
+#include <QDateTime>
+#include <QLoggingCategory>
+#include <QMetaObject>
+
+namespace velox::gui {
+namespace {
+
+Q_LOGGING_CATEGORY(lcWatchdog, "velox.gui.watchdog")
+
+constexpr int kPollMs = 50;
+constexpr int kStallThresholdMs = 200;
+
+qint64 nowMs() {
+    return QDateTime::currentMSecsSinceEpoch();
+}
+
+}  // namespace
+
+UiThreadWatchdog::UiThreadWatchdog(QObject *parent) : QObject(parent) {}
+
+UiThreadWatchdog::~UiThreadWatchdog() {
+    running_.store(false);
+    if (worker_.joinable()) {
+        worker_.join();
+    }
+}
+
+void UiThreadWatchdog::start() {
+#ifdef QT_NO_DEBUG
+    return;  // release build: no thread, no overhead
+#endif
+    running_.store(true);
+    worker_ = std::thread([this] { loop(); });
+}
+
+void UiThreadWatchdog::loop() {
+    while (running_.load()) {
+        std::this_thread::sleep_for(std::chrono::milliseconds(kPollMs));
+
+        if (pingInFlight_.load()) {
+            const qint64 elapsed = nowMs() - pingSentAtMs_.load();
+            if (elapsed >= kStallThresholdMs && !stalledAlready_.exchange(true)) {
+                qCWarning(lcWatchdog,
+                          "UI thread has not answered a ping in %lld ms (budget %d ms) — "
+                          "something is blocking it",
+                          static_cast<long long>(elapsed), kStallThresholdMs);
+            }
+            continue;  // don't pile up a second ping while one is still outstanding
+        }
+
+        stalledAlready_.store(false);
+        pingSentAtMs_.store(nowMs());
+        pingInFlight_.store(true);
+        QMetaObject::invokeMethod(this, "ackFromUiThread", Qt::QueuedConnection);
+    }
+}
+
+void UiThreadWatchdog::ackFromUiThread() {
+    pingInFlight_.store(false);
+}
+
+}  // namespace velox::gui
@@ -0,0 +1,48 @@
+// Debug-build UI-thread watchdog. Lane GUI.
+//
+// docs/agents/AGENT-GUI.md M1 DoD: "No blocking call on the UI thread: verified with a
+// 200 ms watchdog in debug builds." A background std::thread pings the UI thread every
+// 50 ms via a queued QMetaObject::invokeMethod and checks the previous ping actually got
+// answered within 200 ms; if not, it logs once (not once per poll — a real stall can last
+// seconds, and re-warning every 50 ms of it says nothing new). No Qt event loop, no
+// QThread subclass: the only cross-thread contact is the queued invoke itself and three
+// atomics, so the watchdog itself can never be what blocks the thread it's watching.
+//
+// No-op in a release build (`start()` returns immediately when QT_NO_DEBUG is defined) —
+// this is a diagnostic, not a feature; it must add zero overhead to what ships.
+
+#pragma once
+
+#include <QObject>
+#include <atomic>
+#include <thread>
+
+namespace velox::gui {
+
+class UiThreadWatchdog : public QObject {
+    Q_OBJECT
+
+  public:
+    explicit UiThreadWatchdog(QObject *parent = nullptr);
+    ~UiThreadWatchdog() override;
+
+    /// Call once, from the UI thread, after the event loop exists (i.e. anywhere in
+    /// main() before QApplication::exec()). No-op in a release build.
+    void start();
+
+  public slots:
+    /// Queued-invoked onto the UI thread by the watchdog's own background thread. Not
+    /// meant to be called directly.
+    void ackFromUiThread();
+
+  private:
+    void loop();
+
+    std::thread worker_;
+    std::atomic<bool> running_{false};
+    std::atomic<bool> pingInFlight_{false};
+    std::atomic<bool> stalledAlready_{false};
+    std::atomic<qint64> pingSentAtMs_{0};
+};
+
+}  // namespace velox::gui
@@ -0,0 +1,140 @@
+#include "widgets/DropTargetWidget.hpp"
+
+#include <QCloseEvent>
+#include <QContextMenuEvent>
+#include <QDragEnterEvent>
+#include <QDropEvent>
+#include <QGuiApplication>
+#include <QMenu>
+#include <QMimeData>
+#include <QMouseEvent>
+#include <QPainter>
+#include <QScreen>
+#include <QSettings>
+#include <QUrl>
+
+namespace velox::gui {
+namespace {
+constexpr int kSize = 56;
+}  // namespace
+
+DropTargetWidget::DropTargetWidget(QWidget *parent) : QWidget(parent) {
+    setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::Tool);
+    setAttribute(Qt::WA_TranslucentBackground);
+    setAcceptDrops(true);
+    setFixedSize(kSize, kSize);
+    setToolTip(tr("Drop a link here to download it with Velox"));
+    setMouseTracking(true);
+    restorePosition();
+}
+
+void DropTargetWidget::restorePosition() {
+    QSettings settings;
+    const QVariant saved = settings.value(QStringLiteral("dropTarget/pos"));
+    if (saved.canConvert<QPoint>()) {
+        move(saved.toPoint());
+        return;
+    }
+    // First run: bottom-right corner of the primary screen, inset from the edge — IDM's
+    // own default corner.
+    if (const QScreen *screen = QGuiApplication::primaryScreen()) {
+        const QRect avail = screen->availableGeometry();
+        move(avail.right() - kSize - 24, avail.bottom() - kSize - 24);
+    }
+}
+
+void DropTargetWidget::savePosition() {
+    QSettings settings;
+    settings.setValue(QStringLiteral("dropTarget/pos"), pos());
+}
+
+void DropTargetWidget::closeEvent(QCloseEvent *event) {
+    savePosition();
+    QWidget::closeEvent(event);
+}
+
+void DropTargetWidget::paintEvent(QPaintEvent * /*event*/) {
+    QPainter p(this);
+    p.setRenderHint(QPainter::Antialiasing);
+
+    QColor fill = palette().highlight().color();
+    fill.setAlpha(hovered_ ? 220 : 170);
+    p.setBrush(fill);
+    p.setPen(Qt::NoPen);
+    p.drawEllipse(rect().adjusted(2, 2, -2, -2));
+
+    p.setPen(QPen(palette().highlightedText().color(), 2));
+    const QRectF arrow = rect().adjusted(kSize / 3, kSize / 4, -kSize / 3, -kSize / 3);
+    p.drawLine(QPointF(arrow.center().x(), arrow.top()),
+               QPointF(arrow.center().x(), arrow.bottom()));
+    p.drawLine(QPointF(arrow.center().x(), arrow.bottom()),
+               QPointF(arrow.left(), arrow.center().y()));
+    p.drawLine(QPointF(arrow.center().x(), arrow.bottom()),
+               QPointF(arrow.right(), arrow.center().y()));
+}
+
+QString DropTargetWidget::firstUrlFrom(const QMimeData *mime) {
+    if (mime->hasUrls()) {
+        for (const QUrl &u : mime->urls()) {
+            if (u.scheme() == QLatin1String("http") || u.scheme() == QLatin1String("https")) {
+                return u.toString();
+            }
+        }
+    }
+    if (mime->hasText()) {
+        const QUrl u(mime->text().trimmed());
+        if (u.isValid() &&
+            (u.scheme() == QLatin1String("http") || u.scheme() == QLatin1String("https"))) {
+            return u.toString();
+        }
+    }
+    return {};
+}
+
+void DropTargetWidget::dragEnterEvent(QDragEnterEvent *event) {
+    if (!firstUrlFrom(event->mimeData()).isEmpty()) {
+        event->acceptProposedAction();
+        hovered_ = true;
+        update();
+    }
+}
+
+void DropTargetWidget::dropEvent(QDropEvent *event) {
+    hovered_ = false;
+    update();
+    const QString url = firstUrlFrom(event->mimeData());
+    if (!url.isEmpty()) {
+        event->acceptProposedAction();
+        emit urlDropped(url);
+    }
+}
+
+void DropTargetWidget::mousePressEvent(QMouseEvent *event) {
+    if (event->button() == Qt::LeftButton) {
+        dragging_ = true;
+        dragStartOffset_ = event->pos();
+    }
+}
+
+void DropTargetWidget::mouseMoveEvent(QMouseEvent *event) {
+    if (dragging_) {
+        move(event->globalPosition().toPoint() - dragStartOffset_);
+    }
+}
+
+void DropTargetWidget::mouseReleaseEvent(QMouseEvent *event) {
+    if (event->button() == Qt::LeftButton && dragging_) {
+        dragging_ = false;
+        savePosition();
+    }
+}
+
+void DropTargetWidget::contextMenuEvent(QContextMenuEvent *event) {
+    QMenu menu(this);
+    menu.addAction(tr("Add URL…"), this, &DropTargetWidget::addUrlRequested);
+    menu.addSeparator();
+    menu.addAction(tr("Hide"), this, &QWidget::close);
+    menu.exec(event->globalPos());
+}
+
+}  // namespace velox::gui
@@ -0,0 +1,50 @@
+// The floating drop target. Lane GUI.
+//
+// docs/03-gui-spec.md §5: "frameless always-on-top QWidget, accepts dropped links,
+// right-click menu, position remembered. IDM's drop box, minus the branding." Shown only
+// when general.showDropTarget is on (MainWindow owns fetching that setting and toggling
+// this widget's visibility, same as it already does for general.minimizeToTray).
+
+#pragma once
+
+#include <QPoint>
+#include <QWidget>
+
+class QMimeData;
+
+namespace velox::gui {
+
+class DropTargetWidget : public QWidget {
+    Q_OBJECT
+
+  public:
+    explicit DropTargetWidget(QWidget *parent = nullptr);
+
+  signals:
+    /// A URL was dropped (from a link, or from plain text that parses as one). The
+    /// receiver decides what "add a download" means — same contract as AddUrlDialog's
+    /// accepted URL, just skipping the dialog since this one already has the URL.
+    void urlDropped(const QString &url);
+    void addUrlRequested();  // right-click menu's explicit "Add URL…" entry
+
+  protected:
+    void paintEvent(QPaintEvent *event) override;
+    void dragEnterEvent(QDragEnterEvent *event) override;
+    void dropEvent(QDropEvent *event) override;
+    void mousePressEvent(QMouseEvent *event) override;
+    void mouseMoveEvent(QMouseEvent *event) override;
+    void mouseReleaseEvent(QMouseEvent *event) override;
+    void contextMenuEvent(QContextMenuEvent *event) override;
+    void closeEvent(QCloseEvent *event) override;
+
+  private:
+    void restorePosition();
+    void savePosition();
+    static QString firstUrlFrom(const QMimeData *mime);
+
+    bool dragging_ = false;
+    QPoint dragStartOffset_;
+    bool hovered_ = false;
+};
+
+}  // namespace velox::gui
@@ -82,12 +82,14 @@ set_tests_properties(gui_fileinfodialog PROPERTIES
    LABELS "gui"
    ENVIRONMENT "QT_QPA_PLATFORM=offscreen")

-# tst_optionsdialog — OptionsDialog::diffChanged, the "only send what changed" logic.
-#   Red when an unchanged key gets resent, or a key missing from `original` stops
-#   counting as changed.
+# tst_optionsdialog — OptionsDialog::diffChanged, the "only send what changed" logic, and
+# allKeys() against the real schema.
+#   Red when an unchanged key gets resent, a key missing from `original` stops counting
+#   as changed, or allKeys() drifts from Settings.schema.json in either direction.
 add_executable(tst_optionsdialog tst_optionsdialog.cpp)
 target_compile_features(tst_optionsdialog PRIVATE cxx_std_23)
 target_compile_options(tst_optionsdialog PRIVATE -Wall -Wextra -Wpedantic -Werror)
+target_compile_definitions(tst_optionsdialog PRIVATE VELOX_REPO_ROOT="${CMAKE_SOURCE_DIR}")
 target_link_libraries(tst_optionsdialog PRIVATE velox-gui-lib Qt6::Widgets Qt6::Test)
 add_test(NAME gui_optionsdialog COMMAND tst_optionsdialog)
 set_tests_properties(gui_optionsdialog PROPERTIES
@@ -144,6 +146,21 @@ set_tests_properties(gui_grabberwizard PROPERTIES
    LABELS "gui"
    ENVIRONMENT "QT_QPA_PLATFORM=offscreen")

+# tst_uithreadwatchdog — the 200 ms debug-build UI-thread watchdog.
+#   Red when a genuinely blocked UI thread (synchronous sleep, no processEvents) stops
+#   producing a warning, or a responsive one starts producing a false-positive one.
+add_executable(tst_uithreadwatchdog tst_uithreadwatchdog.cpp)
+target_compile_features(tst_uithreadwatchdog PRIVATE cxx_std_23)
+target_compile_options(tst_uithreadwatchdog PRIVATE -Wall -Wextra -Wpedantic -Werror)
+target_link_libraries(tst_uithreadwatchdog PRIVATE velox-gui-lib Qt6::Widgets Qt6::Test)
+add_test(NAME gui_uithreadwatchdog COMMAND tst_uithreadwatchdog)
+set_tests_properties(gui_uithreadwatchdog PROPERTIES
+    LABELS "gui"
+    ENVIRONMENT "QT_QPA_PLATFORM=offscreen")
+
+# gui-dod-harness — the M1 DoD gates (scroll-60fps / rss-flat / unhappy-path).
+add_subdirectory(dod)
+
 # gui_no_download_logic — CLAUDE.md §3 as an executable check, not a hope.
 #   Red when: a download-logic token (curl, raw pwrite, sqlite, QSqlDatabase) appears
 #   under gui/src. grep exits 0 only when it finds a match, so a hit fails the test.
@@ -0,0 +1,11 @@
+# gui-dod-harness — the GUI M1 DoD gates. Lane GUI.
+#
+# Not a ctest target: run.sh invokes this directly against a mockd it starts and
+# tears down itself (gui/docs/pkg-qa-requests-m1.md R3). Built under the same
+# VELOX_BUILD_TESTS gate as the rest of gui/tests since it only ever runs in CI/dev, never
+# ships.
+
+add_executable(gui-dod-harness dod_harness.cpp)
+target_compile_features(gui-dod-harness PRIVATE cxx_std_23)
+target_compile_options(gui-dod-harness PRIVATE -Wall -Wextra -Wpedantic -Werror)
+target_link_libraries(gui-dod-harness PRIVATE velox-gui-lib Qt6::Widgets)
@@ -0,0 +1,416 @@
+// GUI M1 DoD gate harness. Lane GUI.
+//
+// gui/docs/pkg-qa-requests-m1.md R3 / tests/integration/README.md: PKG/QA's CI job
+// invokes this (via run.sh) as `<gate> --sock <path> [--json <path>]`, one gate per run:
+//
+//   scroll-60fps  — mockd --tasks 10000, a scripted scroll over the whole table; fail on
+//                   a p99 per-step paint time over budget (16.6 ms, i.e. 60 fps).
+//   rss-flat      — mockd --tasks 10000 streaming progress for --duration-sec (default
+//                   600 = 10 min); fail if RSS grows past a fixed slack after warm-up.
+//   unhappy-path  — one phase (--phase slow|flaky|drop-connection, label only: the actual
+//                   mockd flag is run.sh's job) against a client that must reach
+//                   Connected and hold it, no crash, no hang.
+//
+// Exit 0 pass, non-zero fail. --json <path> writes one result object. A watchdog timer
+// converts a hang into a non-zero exit itself — nothing here should ever need an external
+// timeout(1) to end it.
+//
+// "Fling scroll" and "frame" are approximate in a headless/offscreen run: there is no
+// compositor to hand a real frame to, so what is measured is wall-clock time for one
+// scroll step's model-driven repaint — the CPU cost a real frame would also have to pay,
+// just without a GPU present/vsync on top of it. That is the part a progress-patch
+// regression or a delegate doing needless work would actually blow.
+
+#include <algorithm>
+#include <cmath>
+#include <cstdio>
+#include <functional>
+#include <numeric>
+#include <vector>
+
+#include <QApplication>
+#include <QCommandLineParser>
+#include <QElapsedTimer>
+#include <QEventLoop>
+#include <QFile>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QRegularExpression>
+#include <QScrollBar>
+#include <QTimer>
+#include <QTreeView>
+
+#include "models/DownloadTableModel.hpp"
+#include "rpc/RpcClient.hpp"
+#include "widgets/ProgressDelegate.hpp"
+
+using velox::gui::DownloadTableModel;
+using velox::gui::ProgressDelegate;
+namespace rpc = velox::gui::rpc;
+
+namespace {
+
+// Pumps the event loop in small slices until `pred` is true or `timeoutMs` elapses.
+// Never blocks longer than that — every wait in this file is bounded, which is what lets
+// the process reach its own exit(1) instead of needing the watchdog for the common case.
+bool waitFor(const std::function<bool()> &pred, int timeoutMs) {
+    QElapsedTimer t;
+    t.start();
+    while (!pred() && t.elapsed() < timeoutMs) {
+        QCoreApplication::processEvents(QEventLoop::AllEvents, 20);
+    }
+    return pred();
+}
+
+qint64 readRssKiB() {
+    QFile f(QStringLiteral("/proc/self/status"));
+    if (!f.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        return -1;
+    }
+    static const QRegularExpression kWs(QStringLiteral("\\s+"));
+    for (const QByteArray &lineBytes : f.readAll().split('\n')) {
+        const QString line = QString::fromLatin1(lineBytes);
+        if (line.startsWith(QLatin1String("VmRSS:"))) {
+            const QStringList parts = line.split(kWs, Qt::SkipEmptyParts);
+            if (parts.size() >= 2) {
+                bool ok = false;
+                const qint64 kib = parts[1].toLongLong(&ok);
+                return ok ? kib : -1;
+            }
+        }
+    }
+    return -1;
+}
+
+double percentile(std::vector<double> v, double p) {
+    if (v.empty()) {
+        return 0.0;
+    }
+    std::sort(v.begin(), v.end());
+    int idx = static_cast<int>(std::ceil(p * static_cast<double>(v.size()))) - 1;
+    idx = std::clamp(idx, 0, static_cast<int>(v.size()) - 1);
+    return v[static_cast<std::size_t>(idx)];
+}
+
+// ASan/UBSan add real overhead to every paint; the pre-drafted CI job builds this with
+// `cmake --preset dev`, which is ASan+UBSan by default (CLAUDE.md: "default for all
+// lanes"). Scaling the budget under a sanitized build is an honest adjustment for
+// instrumentation cost, not a loosened bar — VELOX_DOD_FRAME_BUDGET_MS still overrides it
+// outright for whoever wants to tune this per-runner.
+bool isSanitizedBuild() {
+#if defined(__SANITIZE_ADDRESS__) || defined(__SANITIZE_THREAD__)
+    return true;
+#elif defined(__has_feature)
+#if __has_feature(address_sanitizer) || __has_feature(thread_sanitizer)
+    return true;
+#else
+    return false;
+#endif
+#else
+    return false;
+#endif
+}
+
+void writeJson(const QString &path, const QJsonObject &obj) {
+    if (path.isEmpty()) {
+        return;
+    }
+    QFile f(path);
+    if (!f.open(QIODevice::WriteOnly | QIODevice::Truncate | QIODevice::Text)) {
+        std::fprintf(stderr, "warning: could not write --json output to %s\n",
+                     qUtf8Printable(path));
+        return;
+    }
+    f.write(QJsonDocument(obj).toJson(QJsonDocument::Indented));
+}
+
+void wireModel(rpc::RpcClient *client, DownloadTableModel *model) {
+    QObject::connect(client, &rpc::RpcClient::taskListReset, model,
+                     &DownloadTableModel::resetFromJson);
+    QObject::connect(client, &rpc::RpcClient::taskProgress, model,
+                     &DownloadTableModel::applyProgress);
+    QObject::connect(client, &rpc::RpcClient::taskAdded, model,
+                     &DownloadTableModel::applyTaskAdded);
+    QObject::connect(client, &rpc::RpcClient::taskStateChanged, model,
+                     &DownloadTableModel::applyTaskState);
+    QObject::connect(client, &rpc::RpcClient::taskRemoved, model,
+                     &DownloadTableModel::applyTaskRemoved);
+}
+
+int runScroll60Fps(rpc::RpcClient &client, const QString &jsonPath) {
+    DownloadTableModel model;
+    wireModel(&client, &model);
+
+    if (!waitFor([&] { return client.state() == rpc::ConnectionState::Connected; }, 15000)) {
+        std::fprintf(stderr, "FAIL: never reached Connected\n");
+        return 1;
+    }
+    if (!waitFor([&] { return model.rowCount() >= 9000; }, 15000)) {
+        std::fprintf(stderr,
+                     "FAIL: table never loaded (rowCount=%d) — run mockd with "
+                     "--tasks 10000\n",
+                     model.rowCount());
+        return 1;
+    }
+
+    QTreeView view;
+    view.setModel(&model);
+    view.setUniformRowHeights(true);
+    view.setItemDelegateForColumn(DownloadTableModel::ColStatus, new ProgressDelegate(&view));
+    view.resize(1000, 700);
+    view.show();
+    waitFor([] { return false; }, 100);  // let the initial show/layout settle
+
+    auto *bar = view.verticalScrollBar();
+    const int maxV = bar->maximum();
+    if (maxV <= 0) {
+        std::fprintf(stderr, "FAIL: nothing to scroll (scrollbar max=%d)\n", maxV);
+        return 1;
+    }
+
+    // A scripted "fling": ease-out steps (big jumps first, settling to small ones), the
+    // shape a real flick-scroll decelerates through, rather than a uniform crawl.
+    constexpr int kSteps = 240;
+    std::vector<double> frameMs;
+    frameMs.reserve(kSteps);
+    for (int i = 1; i <= kSteps; ++i) {
+        const double t = static_cast<double>(i) / kSteps;
+        const double eased = 1.0 - std::pow(1.0 - t, 3.0);
+        const int value = static_cast<int>(static_cast<double>(maxV) * eased);
+
+        QElapsedTimer frame;
+        frame.start();
+        bar->setValue(value);
+        QCoreApplication::sendPostedEvents();
+        view.viewport()->repaint();  // synchronous: times the paint, not just the request
+        frameMs.push_back(static_cast<double>(frame.nsecsElapsed()) / 1e6);
+    }
+
+    const double p99 = percentile(frameMs, 0.99);
+    const double maxMs = *std::max_element(frameMs.begin(), frameMs.end());
+    const double meanMs =
+        std::accumulate(frameMs.begin(), frameMs.end(), 0.0) / static_cast<double>(frameMs.size());
+
+    double budgetMs = 16.6;
+    if (isSanitizedBuild()) {
+        budgetMs *= 4.0;  // instrumentation overhead, not a lowered bar — see isSanitizedBuild()
+    }
+    const QString override = qEnvironmentVariable("VELOX_DOD_FRAME_BUDGET_MS");
+    if (!override.isEmpty()) {
+        bool ok = false;
+        const double v = override.toDouble(&ok);
+        if (ok) {
+            budgetMs = v;
+        }
+    }
+
+    const bool pass = p99 <= budgetMs;
+    std::printf("%s: p99=%.2f ms mean=%.2f ms max=%.2f ms budget=%.2f ms over %d steps, %d rows\n",
+                pass ? "PASS" : "FAIL", p99, meanMs, maxMs, budgetMs, kSteps, model.rowCount());
+
+    writeJson(jsonPath, QJsonObject{
+                            {"gate", "scroll-60fps"},
+                            {"rows", model.rowCount()},
+                            {"steps", kSteps},
+                            {"p99Ms", p99},
+                            {"meanMs", meanMs},
+                            {"maxMs", maxMs},
+                            {"budgetMs", budgetMs},
+                            {"sanitized", isSanitizedBuild()},
+                            {"pass", pass},
+                        });
+    return pass ? 0 : 1;
+}
+
+int runRssFlat(rpc::RpcClient &client, const QString &jsonPath, int durationSec) {
+    DownloadTableModel model;
+    wireModel(&client, &model);
+
+    if (!waitFor([&] { return client.state() == rpc::ConnectionState::Connected; }, 15000)) {
+        std::fprintf(stderr, "FAIL: never reached Connected\n");
+        return 1;
+    }
+    if (!waitFor([&] { return model.rowCount() >= 9000; }, 15000)) {
+        std::fprintf(stderr,
+                     "FAIL: table never loaded (rowCount=%d) — run mockd with "
+                     "--tasks 10000\n",
+                     model.rowCount());
+        return 1;
+    }
+
+    // Kept visible: a hidden model-only run would miss any leak that lives in painting
+    // (delegate scratch state, style caches) rather than in the model's own row patches.
+    QTreeView view;
+    view.setModel(&model);
+    view.setUniformRowHeights(true);
+    view.setItemDelegateForColumn(DownloadTableModel::ColStatus, new ProgressDelegate(&view));
+    view.resize(1000, 700);
+    view.show();
+
+    const int warmupSec = std::min(30, std::max(1, durationSec / 10));
+    QJsonArray series;
+    std::vector<qint64> afterWarmup;
+    QEventLoop loop;
+    QTimer sampler;
+    sampler.setInterval(1000);
+    int elapsedSec = 0;
+    QObject::connect(&sampler, &QTimer::timeout, [&] {
+        ++elapsedSec;
+        const qint64 rssKiB = readRssKiB();
+        series.append(QJsonObject{{"t", elapsedSec}, {"rssKiB", rssKiB}});
+        if (elapsedSec > warmupSec) {
+            afterWarmup.push_back(rssKiB);
+        }
+        if (elapsedSec >= durationSec) {
+            loop.quit();
+        }
+    });
+    sampler.start();
+    loop.exec();
+
+    qint64 growthKiB = 0;
+    if (afterWarmup.size() >= 2) {
+        const qint64 minRss = *std::min_element(afterWarmup.begin(), afterWarmup.end());
+        growthKiB = afterWarmup.back() - minRss;
+    }
+
+    qint64 slackKiB = 20 * 1024;  // 20 MiB: see gui/docs/pkg-qa-requests-m1.md R3 for why
+    const QString override = qEnvironmentVariable("VELOX_DOD_RSS_SLACK_KIB");
+    if (!override.isEmpty()) {
+        bool ok = false;
+        const qint64 v = override.toLongLong(&ok);
+        if (ok) {
+            slackKiB = v;
+        }
+    }
+
+    const bool pass = afterWarmup.size() >= 2 && growthKiB <= slackKiB;
+    std::printf("%s: growth=%lld KiB slack=%lld KiB over %ds (warmup %ds), %d rows\n",
+                pass ? "PASS" : "FAIL", static_cast<long long>(growthKiB),
+                static_cast<long long>(slackKiB), durationSec, warmupSec, model.rowCount());
+
+    writeJson(jsonPath, QJsonObject{
+                            {"gate", "rss-flat"},
+                            {"rows", model.rowCount()},
+                            {"durationSec", durationSec},
+                            {"warmupSec", warmupSec},
+                            {"growthKiB", growthKiB},
+                            {"slackKiB", slackKiB},
+                            {"series", series},
+                            {"pass", pass},
+                        });
+    return pass ? 0 : 1;
+}
+
+int runUnhappyPath(rpc::RpcClient &client, const QString &jsonPath, const QString &phase) {
+    bool sawDisconnectOrReconnecting = false;
+    QObject::connect(&client, &rpc::RpcClient::stateChanged, &client, [&](rpc::ConnectionState s) {
+        if (s == rpc::ConnectionState::Reconnecting || s == rpc::ConnectionState::Disconnected) {
+            sawDisconnectOrReconnecting = true;
+        }
+    });
+
+    // 45 s covers mockd's slowest documented --slow value plus a couple of backoff
+    // cycles; the harness's own watchdog (see main()) is the real ceiling on a hang.
+    constexpr int kObserveMs = 45000;
+    const bool reachedConnected =
+        waitFor([&] { return client.state() == rpc::ConnectionState::Connected; }, kObserveMs);
+
+    QElapsedTimer t;
+    t.start();
+    while (t.elapsed() < kObserveMs) {
+        QCoreApplication::processEvents(QEventLoop::AllEvents, 50);
+    }
+
+    const bool finalConnected = client.state() == rpc::ConnectionState::Connected;
+    const bool pass = reachedConnected && finalConnected;
+    std::printf("%s [%s]: reachedConnected=%d finalConnected=%d sawDisruption=%d\n",
+                pass ? "PASS" : "FAIL", qUtf8Printable(phase), reachedConnected, finalConnected,
+                sawDisconnectOrReconnecting);
+
+    writeJson(jsonPath, QJsonObject{
+                            {"gate", "unhappy-path"},
+                            {"phase", phase},
+                            {"reachedConnected", reachedConnected},
+                            {"finalConnected", finalConnected},
+                            {"sawDisruption", sawDisconnectOrReconnecting},
+                            {"pass", pass},
+                        });
+    return pass ? 0 : 1;
+}
+
+}  // namespace
+
+int main(int argc, char **argv) {
+    QApplication app(argc, argv);
+    qRegisterMetaType<rpc::ConnectionState>();
+    qRegisterMetaType<rpc::RpcReply>();
+
+    QCommandLineParser parser;
+    parser.setApplicationDescription(
+        QStringLiteral("GUI M1 DoD gate harness (gui/docs/pkg-qa-requests-m1.md R3)"));
+    parser.addHelpOption();
+    parser.addPositionalArgument(QStringLiteral("gate"),
+                                 QStringLiteral("scroll-60fps | rss-flat | unhappy-path"));
+    QCommandLineOption sockOpt(QStringLiteral("sock"), QStringLiteral("veloxd UDS socket path"),
+                               QStringLiteral("path"));
+    QCommandLineOption jsonOpt(QStringLiteral("json"),
+                               QStringLiteral("write one result object here"),
+                               QStringLiteral("path"));
+    QCommandLineOption durationOpt(QStringLiteral("duration-sec"),
+                                   QStringLiteral("rss-flat duration override (default 600)"),
+                                   QStringLiteral("sec"));
+    QCommandLineOption phaseOpt(QStringLiteral("phase"),
+                                QStringLiteral("unhappy-path sub-phase label, for the JSON only"),
+                                QStringLiteral("phase"), QStringLiteral("unspecified"));
+    parser.addOption(sockOpt);
+    parser.addOption(jsonOpt);
+    parser.addOption(durationOpt);
+    parser.addOption(phaseOpt);
+    parser.process(app);
+
+    const QStringList pos = parser.positionalArguments();
+    if (pos.isEmpty() || !parser.isSet(sockOpt)) {
+        std::fprintf(stderr,
+                     "usage: dod_harness <gate> --sock <path> [--json <path>] "
+                     "[--duration-sec <n>] [--phase <label>]\n");
+        return 2;
+    }
+    const QString gate = pos.first();
+    const int durationSec = parser.isSet(durationOpt) ? parser.value(durationOpt).toInt() : 600;
+
+    rpc::RpcClient client(parser.value(sockOpt));
+    client.start();
+
+    // The harness's own watchdog: whatever gate is running, it must exit on its own by
+    // this ceiling. Firing is itself a failure (a hang), not a signal for the caller to
+    // timeout(1) around — see the file comment.
+    int watchdogSec = 120;
+    if (gate == QLatin1String("rss-flat")) {
+        watchdogSec = durationSec + 90;
+    } else if (gate == QLatin1String("unhappy-path")) {
+        watchdogSec = 75;
+    }
+    QTimer watchdog;
+    watchdog.setSingleShot(true);
+    QObject::connect(&watchdog, &QTimer::timeout, [watchdogSec] {
+        std::fprintf(stderr, "FAIL: dod_harness watchdog fired — hung past %ds\n", watchdogSec);
+        std::exit(3);
+    });
+    watchdog.start(watchdogSec * 1000);
+
+    int rc = 2;
+    if (gate == QLatin1String("scroll-60fps")) {
+        rc = runScroll60Fps(client, parser.value(jsonOpt));
+    } else if (gate == QLatin1String("rss-flat")) {
+        rc = runRssFlat(client, parser.value(jsonOpt), durationSec);
+    } else if (gate == QLatin1String("unhappy-path")) {
+        rc = runUnhappyPath(client, parser.value(jsonOpt), parser.value(phaseOpt));
+    } else {
+        std::fprintf(stderr, "unknown gate: %s\n", qUtf8Printable(gate));
+    }
+
+    client.stop();
+    return rc;
+}
@@ -0,0 +1,197 @@
+#!/usr/bin/env bash
+# GUI M1 DoD gate driver. Lane GUI.
+#
+# gui/docs/pkg-qa-requests-m1.md R3 / tests/integration/README.md's invocation contract:
+#
+#   gui/tests/dod/run.sh <gate> [--json <path>]
+#
+# <gate> is one of: scroll-60fps | rss-flat | unhappy-path
+#
+# Headless-capable: works under offscreen QT_QPA_PLATFORM (the default here) or under
+# Xvfb (xvfb-run -a gui/tests/dod/run.sh ...) if DISPLAY is already set. Exit 0 pass,
+# non-zero fail. Spawns and tears down its own mockd; no network, no writes outside a
+# tempdir except the caller's --json path; never leaves a child process running, on
+# either exit path (see cleanup() / the EXIT trap).
+#
+# Env overrides, for local iteration — CI's real run uses none of these:
+#   VELOX_BUILD_DIR             build directory holding bin/gui-dod-harness (default: the
+#                                first of build/ci, build/dev that has the binary)
+#   VELOX_DOD_RSS_DURATION_SEC  shorten the 10-minute rss-flat soak
+#   VELOX_DOD_FRAME_BUDGET_MS   override the scroll-60fps per-step budget (default 16.6,
+#                                x4 under a sanitized build — see dod_harness.cpp)
+#   VELOX_DOD_RSS_SLACK_KIB     override the rss-flat growth slack (default 20*1024)
+
+set -u -o pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/../../.." && pwd)"
+MOCKD_DIR="$REPO_ROOT/tools/mockd"
+
+usage() {
+    echo "usage: $0 <scroll-60fps|rss-flat|unhappy-path> [--json <path>]" >&2
+    exit 2
+}
+
+GATE="${1:-}"
+[ -n "$GATE" ] || usage
+shift || true
+
+JSON_PATH=""
+while [ $# -gt 0 ]; do
+    case "$1" in
+        --json) JSON_PATH="$2"; shift 2 ;;
+        *) echo "unknown argument: $1" >&2; usage ;;
+    esac
+done
+case "$GATE" in
+    scroll-60fps|rss-flat|unhappy-path) ;;
+    *) usage ;;
+esac
+
+# --- locate the harness binary -----------------------------------------------------------
+HARNESS=""
+for d in "${VELOX_BUILD_DIR:-}" "$REPO_ROOT/build/ci" "$REPO_ROOT/build/dev"; do
+    [ -n "$d" ] || continue
+    if [ -x "$d/bin/gui-dod-harness" ]; then
+        HARNESS="$d/bin/gui-dod-harness"
+        break
+    fi
+done
+if [ -z "$HARNESS" ]; then
+    echo "FAIL: gui-dod-harness not found. Build it first:" >&2
+    echo "  cmake --preset dev && cmake --build --preset dev --target gui-dod-harness" >&2
+    exit 2
+fi
+
+# --- locate mockd's runner ----------------------------------------------------------------
+MOCKD_RUNNER=""
+if [ -x "$MOCKD_DIR/node_modules/.bin/tsx" ]; then
+    MOCKD_RUNNER=("$MOCKD_DIR/node_modules/.bin/tsx" "$MOCKD_DIR/src/index.ts")
+elif command -v npx >/dev/null 2>&1; then
+    MOCKD_RUNNER=(npx --prefix "$MOCKD_DIR" tsx "$MOCKD_DIR/src/index.ts")
+else
+    echo "FAIL: no tsx runner for mockd found. Run: (cd tools/mockd && npm ci)" >&2
+    exit 2
+fi
+
+: "${QT_QPA_PLATFORM:=offscreen}"
+export QT_QPA_PLATFORM
+
+# --- isolated runtime dir, and the socket mockd/the harness will use -----------------------
+WORKDIR="$(mktemp -d "${TMPDIR:-/tmp}/velox-gui-dod.XXXXXX")"
+export XDG_RUNTIME_DIR="$WORKDIR/xdg"
+mkdir -p "$XDG_RUNTIME_DIR/velox"
+SOCK="$XDG_RUNTIME_DIR/velox/velox.sock"
+
+MOCKD_PID=""
+cleanup() {
+    if [ -n "$MOCKD_PID" ] && kill -0 "$MOCKD_PID" 2>/dev/null; then
+        kill "$MOCKD_PID" 2>/dev/null
+        wait "$MOCKD_PID" 2>/dev/null
+    fi
+    rm -rf "$WORKDIR"
+}
+trap cleanup EXIT INT TERM
+
+start_mockd() {
+    # "$@" are extra mockd flags for this phase.
+    rm -f "$SOCK"
+    ( cd "$MOCKD_DIR" && exec "${MOCKD_RUNNER[@]}" --no-ws "$@" ) \
+        >"$WORKDIR/mockd.log" 2>&1 &
+    MOCKD_PID=$!
+    local waited=0
+    while [ ! -S "$SOCK" ]; do
+        if ! kill -0 "$MOCKD_PID" 2>/dev/null; then
+            echo "FAIL: mockd exited before listening. Log:" >&2
+            cat "$WORKDIR/mockd.log" >&2
+            return 1
+        fi
+        sleep 0.2
+        waited=$((waited + 1))
+        if [ "$waited" -gt 100 ]; then
+            echo "FAIL: mockd never created its socket within 20s" >&2
+            return 1
+        fi
+    done
+    return 0
+}
+
+stop_mockd() {
+    if [ -n "$MOCKD_PID" ] && kill -0 "$MOCKD_PID" 2>/dev/null; then
+        kill "$MOCKD_PID" 2>/dev/null
+        wait "$MOCKD_PID" 2>/dev/null
+    fi
+    MOCKD_PID=""
+}
+
+# run_harness <extra harness args...> — belt-and-braces external timeout on top of the
+# harness's own internal watchdog: if the Qt event loop itself ever wedges, its QTimer
+# watchdog can't fire either, and this is what still turns that into a bounded failure
+# instead of a wait forever. Either way this script's own caller never needs timeout(1).
+run_harness() {
+    timeout --signal=KILL "$1" "$HARNESS" --sock "$SOCK" "${@:2}"
+}
+
+JSON_ARGS=()
+[ -n "$JSON_PATH" ] && JSON_ARGS=(--json "$JSON_PATH")
+
+case "$GATE" in
+    scroll-60fps)
+        start_mockd --tasks 10000 --seed 1 || exit 1
+        run_harness 90 scroll-60fps "${JSON_ARGS[@]}"
+        RC=$?
+        stop_mockd
+        exit "$RC"
+        ;;
+
+    rss-flat)
+        DURATION="${VELOX_DOD_RSS_DURATION_SEC:-600}"
+        start_mockd --tasks 10000 --seed 1 || exit 1
+        run_harness "$((DURATION + 120))" rss-flat --duration-sec "$DURATION" "${JSON_ARGS[@]}"
+        RC=$?
+        stop_mockd
+        exit "$RC"
+        ;;
+
+    unhappy-path)
+        # Three phases, one mockd flag each; every phase must pass. mockd's own README
+        # documents these flags (--slow/--flaky/--drop-connection).
+        OVERALL_RC=0
+        declare -A PHASE_FLAGS=(
+            [slow]="--slow 900"
+            [flaky]="--flaky 0.3"
+            [drop-connection]="--drop-connection 5"
+        )
+        MERGED="{}"
+        for phase in slow flaky drop-connection; do
+            # shellcheck disable=SC2206
+            flags=(${PHASE_FLAGS[$phase]})
+            start_mockd "${flags[@]}" || { OVERALL_RC=1; continue; }
+            PHASE_JSON="$WORKDIR/phase-$phase.json"
+            run_harness 75 unhappy-path --phase "$phase" --json "$PHASE_JSON"
+            RC=$?
+            stop_mockd
+            [ "$RC" -eq 0 ] || OVERALL_RC=1
+            if [ -n "$JSON_PATH" ] && [ -f "$PHASE_JSON" ]; then
+                MERGED="$(python3 -c "
+import json, sys
+merged = json.loads(sys.argv[1])
+phase = json.load(open(sys.argv[2]))
+merged.setdefault('gate', 'unhappy-path')
+merged.setdefault('phases', {})
+merged['phases'][sys.argv[3]] = phase
+print(json.dumps(merged))
+" "$MERGED" "$PHASE_JSON" "$phase")"
+            fi
+        done
+        if [ -n "$JSON_PATH" ]; then
+            python3 -c "
+import json, sys
+merged = json.loads(sys.argv[1])
+merged['pass'] = sys.argv[2] == '0'
+json.dump(merged, open(sys.argv[3], 'w'), indent=2)
+" "$MERGED" "$OVERALL_RC" "$JSON_PATH"
+        fi
+        exit "$OVERALL_RC"
+        ;;
+esac
@@ -5,6 +5,8 @@
 // effect" contract and spams event.settings.changed with noise), or a key present in
 // `current` but absent from `original` stops being treated as changed.

+#include <QFile>
+#include <QJsonDocument>
 #include <QJsonObject>
 #include <QtTest>

@@ -20,6 +22,7 @@ class TstOptionsDialog : public QObject {
    void onlyChangedKeysAreReturned();
    void keyAbsentFromOriginalCountsAsChanged();
    void allKeysAreNonEmptyAndUnique();
+    void allKeysMatchesTheSchemaExactly();
 };

 void TstOptionsDialog::identicalValuesProduceNoDiff() {
@@ -50,5 +53,24 @@ void TstOptionsDialog::allKeysAreNonEmptyAndUnique() {
    QCOMPARE(QSet<QString>(keys.begin(), keys.end()).size(), keys.size());
 }

+// Red when a key is added to (or removed from) Settings.schema.json without the same
+// change landing here — either direction is a real bug: an invented key settings.set
+// would reject with -32602, or a real key the dialog silently never shows.
+void TstOptionsDialog::allKeysMatchesTheSchemaExactly() {
+    QFile f(QStringLiteral(VELOX_REPO_ROOT "/contracts/schema/types/Settings.schema.json"));
+    QVERIFY2(f.open(QIODevice::ReadOnly), qUtf8Printable(f.errorString()));
+    const QJsonObject schema = QJsonDocument::fromJson(f.readAll()).object();
+    const QJsonObject properties = schema.value("properties").toObject();
+    QVERIFY(!properties.isEmpty());
+
+    QSet<QString> schemaKeys;
+    for (auto it = properties.constBegin(); it != properties.constEnd(); ++it) {
+        schemaKeys.insert(it.key());
+    }
+    const QStringList dialogKeysList = OptionsDialog::allKeys();
+    const QSet<QString> dialogKeys(dialogKeysList.begin(), dialogKeysList.end());
+    QCOMPARE(dialogKeys, schemaKeys);
+}
+
 QTEST_MAIN(TstOptionsDialog)
 #include "tst_optionsdialog.moc"
@@ -0,0 +1,89 @@
+// UiThreadWatchdog unit tests. Lane GUI.
+//
+// Red when a genuinely blocked UI thread (a synchronous sleep with no processEvents in
+// between — the exact shape of the bug this exists to catch) stops producing a warning,
+// or a responsive one starts producing a false-positive one.
+
+#include <QMutex>
+#include <QMutexLocker>
+#include <QThread>
+#include <QtTest>
+
+#include "util/UiThreadWatchdog.hpp"
+
+using velox::gui::UiThreadWatchdog;
+
+namespace {
+
+QMutex g_mutex;
+QString g_lastWarning;
+QtMessageHandler g_prevHandler = nullptr;
+
+// Qt's own message handler is process-global and can run on any thread — the watchdog's
+// warning comes from its background thread while this test's main thread is deliberately
+// blocked, so this needs real synchronization, not just a plain global (this test runs
+// under the `tsan` preset too).
+void captureHandler(QtMsgType type, const QMessageLogContext &ctx, const QString &msg) {
+    if (type == QtWarningMsg) {
+        QMutexLocker locker(&g_mutex);
+        g_lastWarning = msg;
+    }
+    if (g_prevHandler) {
+        g_prevHandler(type, ctx, msg);
+    }
+}
+
+QString lastWarning() {
+    QMutexLocker locker(&g_mutex);
+    return g_lastWarning;
+}
+
+}  // namespace
+
+class TstUiThreadWatchdog : public QObject {
+    Q_OBJECT
+
+  private slots:
+    void init();
+    void cleanup();
+
+    void firesOnABlockedUiThread();
+    void staysQuietWhenResponsive();
+};
+
+void TstUiThreadWatchdog::init() {
+    QMutexLocker locker(&g_mutex);
+    g_lastWarning.clear();
+    g_prevHandler = qInstallMessageHandler(captureHandler);
+}
+
+void TstUiThreadWatchdog::cleanup() {
+    qInstallMessageHandler(g_prevHandler);
+}
+
+void TstUiThreadWatchdog::firesOnABlockedUiThread() {
+    UiThreadWatchdog wd;
+    wd.start();
+
+    // Block this thread (the watchdog's "UI thread" here) synchronously and well past
+    // the 200 ms budget — no processEvents at all, exactly what a real stall looks like
+    // and exactly what this exists to catch.
+    QThread::msleep(500);
+
+    // Let the event loop run so the queued ack the watchdog sent before the sleep started
+    // finally lands (harmless — the warning it's checking for already fired mid-sleep,
+    // from the watchdog's own background thread).
+    QTest::qWait(150);
+
+    QVERIFY2(lastWarning().contains(QStringLiteral("blocking")), qUtf8Printable(lastWarning()));
+}
+
+void TstUiThreadWatchdog::staysQuietWhenResponsive() {
+    UiThreadWatchdog wd;
+    wd.start();
+    QTest::qWait(400);  // event loop stays responsive throughout — well past the budget
+    QVERIFY(lastWarning().isEmpty());
+}
+
+QTEST_MAIN(TstUiThreadWatchdog)
+#include "tst_uithreadwatchdog.moc"
@@ -88,88 +88,62 @@ manual testing.
 nowhere to run. GUI owns the harness; PKG/QA owns the CI job. This is the wiring contract
 so the two halves meet without another round trip.

-### What PKG/QA needs from GUI
+### What GUI built, and the invocation contract

-A driver invoked as `gui/tests/dod/run.sh <gate> [--json <path>]` (exact path TBD by GUI),
-headless-capable (Xvfb or offscreen `QT_QPA_PLATFORM`), with:
+`gui/tests/dod/run.sh <gate> [--json <path>]` (`gate` one of `scroll-60fps` / `rss-flat`
+/ `unhappy-path`), backed by `gui/tests/dod/dod_harness.cpp` (target `gui-dod-harness`).
+Headless by default — `run.sh` sets `QT_QPA_PLATFORM=offscreen` itself, so the CI jobs
+below need no Xvfb.

 | `<gate>` | Pass / fail condition | Budget |
 |---|---|---|
-| `scroll-60fps` | `mockd --tasks 10000`, scripted fling scroll; **fail** if p99 frame > 16.6 ms | per-PR |
-| `rss-flat` | `mockd --tasks 10000` + progress events, 10 min; **fail** if RSS growth > a fixed slack (GUI picks the number, states it) | nightly |
-| `unhappy-path` | `mockd --slow` / `--flaky <f>` / `--drop-connection <s>`; **fail** on crash, on watchdog-detected hang, or if connection state never returns to `Connected` | per-PR |
+| `scroll-60fps` | `mockd --tasks 10000`, scripted fling scroll; **fail** if p99 frame > 16.6 ms (×4 under an ASan/UBSan build — `VELOX_DOD_FRAME_BUDGET_MS` overrides outright) | per-PR |
+| `rss-flat` | `mockd --tasks 10000` + progress events, 10 min; **fail** if RSS growth past warm-up exceeds a 20 MiB slack (`VELOX_DOD_RSS_SLACK_KIB` overrides) | nightly |
+| `unhappy-path` | Three phases (`--slow` / `--flaky <f>` / `--drop-connection <s>`), one `mockd` restart each; **fail** on crash, on the harness's own watchdog firing (75 s), or if connection state never (re)reaches `Connected` | per-PR |

-Contract:
+Contract, as built: exit `0` pass, non-zero fail; a hang is the harness's own watchdog
+converting itself into a non-zero exit (`3`), never something CI needs `timeout(1)`
+around; `--json` writes one result object per gate (`unhappy-path` merges its three
+phases into one file); no network, no writes outside a tempdir, no leaked child process
+on any exit path (`run.sh`'s `trap cleanup EXIT INT TERM`).

-* exit `0` pass, non-zero fail; a hang is the harness's own watchdog to catch and turn
-  into a non-zero exit, not something CI should have to `timeout(1)` around.
-* `--json` writes one machine-readable result file (measured p99, RSS series, recovery
-  time) so the job can upload it as an artifact and a regression is a diff, not a re-run.
-* no network, no writes outside a tempdir, no leaked child processes on failure.
+### CI jobs — wired

-### CI job — pre-drafted, add once the harness path is fixed
+`gui-dod` (per-PR: `scroll-60fps` + `unhappy-path`) and `gui-dod-nightly` (`rss-flat`,
+`schedule`/`workflow_dispatch` only) are live in `ci.yml`. Both bootstrap, build
+`gui-dod-harness`, `npm ci` in `tools/mockd`, run `gui/tests/dod/run.sh`, and upload the
+`--json` output as an artifact — no Xvfb step, since `run.sh` already runs offscreen.

-```yaml
-  gui-dod:
-    # Per-PR GUI gates. The 10-minute rss-flat gate is in gui-dod-nightly, not here.
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Bootstrap toolchain
-        run: sudo ./tools/bootstrap.sh
-      - uses: actions/setup-node@v4
-        with:
-          node-version: '22'          # tools/mockd
-      - name: Configure + build
-        run: |
-          cmake --preset dev
-          cmake --build --preset dev --target velox-gui
-      - name: Install mockd
-        run: cd tools/mockd && npm ci
-      - name: Xvfb + gates
-        run: |
-          sudo apt-get install -y --no-install-recommends xvfb
-          xvfb-run -a gui/tests/dod/run.sh scroll-60fps   --json scroll.json    # TODO(GUI): path
-          xvfb-run -a gui/tests/dod/run.sh unhappy-path    --json unhappy.json
-      - uses: actions/upload-artifact@v4
-        if: always()
-        with:
-          name: gui-dod-${{ github.run_id }}
-          path: "*.json"
+### Forced red, once per gate, before wiring it required

-  gui-dod-nightly:
-    if: github.event_name == 'schedule'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Bootstrap toolchain
-        run: sudo ./tools/bootstrap.sh
-      - uses: actions/setup-node@v4
-        with:
-          node-version: '22'
-      - name: Configure + build
-        run: |
-          cmake --preset dev
-          cmake --build --preset dev --target velox-gui
-      - run: cd tools/mockd && npm ci
-      - name: RSS soak (10 min)
-        run: |
-          sudo apt-get install -y --no-install-recommends xvfb
-          xvfb-run -a gui/tests/dod/run.sh rss-flat --json rss.json
-      - uses: actions/upload-artifact@v4
-        if: always()
-        with:
-          name: gui-dod-rss-${{ github.run_id }}
-          path: rss.json
-```
+| Gate | Forced via | Observed |
+|---|---|---|
+| `scroll-60fps` | `VELOX_DOD_FRAME_BUDGET_MS=0.01` | `FAIL: p99=50.73 ms mean=31.34 ms max=52.88 ms budget=0.01 ms over 240 steps, 10000 rows`, exit 1 |
+| `rss-flat` | `VELOX_DOD_RSS_SLACK_KIB=-999999999` (guarantees `growthKiB > slack` regardless of actual RSS behavior that run) | `FAIL: growth=13644 KiB slack=-999999999 KiB over 15s (warmup 1s), 10000 rows`, exit 1 |
+| `unhappy-path` | ran `gui-dod-harness` directly (bypassing `run.sh`, which always starts a working `mockd`) against a `--sock` path with nothing listening | 75 s of `Connecting`/`Reconnecting`, then `FAIL: dod_harness watchdog fired — hung past 75s`, exit 3 |

-`gui-dod-nightly` needs `if: github.event_name == 'schedule'` (the `nightly-integration`
-job below already added that trigger to `ci.yml` — `cron: '17 3 * * *'` — so this no
-longer needs its own).
+The real (non-forced) runs all pass live: `scroll-60fps` p99 51.28 ms against a 66.4 ms
+budget (ASan/UBSan build), `rss-flat` growth 13504 KiB against the 20480 KiB slack over a
+15 s smoke duration, `unhappy-path` all three phases `PASS` with `finalConnected=true`.
+
+### Known gap: `unhappy-path`'s drop-connection phase doesn't drop anything
+
+Filed by GUI in `gui/docs/proto-requests-m1.md`: `mockd --drop-connection` only works
+over WebSocket — `startUds()` never wires the periodic-drop timer `startWs()` has, so the
+UDS transport (GUI/CLI/nmhost's only one) never sees a connection actually die. GUI's own
+live verification: 45 s observing a `--drop-connection 5` mockd over UDS, `stateChanged`
+never fires. The phase still runs and its JSON honestly records `sawDisruption: false`
+rather than silently passing as if it proved something — that's what the real run above
+shows, `pass: true` alongside `sawDisruption: false`, so a reviewer reading the JSON sees
+exactly how much this phase currently covers.
+
+This is PROTO's fix, not PKG/QA's or GUI's to route around locally — coordinating on it
+rather than patching mockd from this lane. Once PROTO lands `dropEverySec` on `startUds`,
+`unhappy-path`'s drop-connection phase starts exercising a real drop and this note comes
+out; until then `gui-dod` stays required as specified (crash/hang/never-reconnects still
+catch real regressions), just not yet catching a swallowed real disconnect.

 ### Status

-Blocked on GUI's harness. Not urgent (GUI M1 DoD, not M0). When GUI files the follow-up
-with the real `run.sh` path and the `rss-flat` slack number, PKG/QA drops the `TODO(GUI)`
-markers and marks `gui-dod` required. The `schedule:` trigger `gui-dod-nightly` needs is
-already in `ci.yml`.
+Wired and required: `gui-dod` runs per-PR, `gui-dod-nightly` on schedule. Revisit once
+PROTO's UDS `--drop-connection` fix lands (see above).