Initial scaffold for kestrove-desktop

Co-Authored-By: Claude Opus 5.5 <[email protected]>

native-messaging/README.md

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+# Native messaging manifests
+
+The installer fills in the placeholders and registers the manifests:
+
+| Browser | Linux | Windows |
+|---|---|---|
+| Chrome | `~/.config/google-chrome/NativeMessagingHosts/app.kestrove.nmh.json` | `HKCU\Software\Google\Chrome\NativeMessagingHosts\app.kestrove.nmh` → path to json |
+| Edge | `~/.config/microsoft-edge/NativeMessagingHosts/` | `HKCU\Software\Microsoft\Edge\NativeMessagingHosts\app.kestrove.nmh` |
+| Firefox | `~/.mozilla/native-messaging-hosts/app.kestrove.nmh.json` | `HKCU\Software\Mozilla\NativeMessagingHosts\app.kestrove.nmh` |
+| Brave | `~/.config/BraveSoftware/Brave-Browser/NativeMessagingHosts/` | same key as Chrome |
+
+`allowed_origins` / `allowed_extensions` pin the host to **your** extension id.
+That is the first line of defense against other extensions (docs/04 A8).

native-messaging/app.kestrove.nmh.chrome.json

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+{
+  "name": "app.kestrove.nmh",
+  "description": "Kestrove native messaging host",
+  "path": "__INSTALL_DIR__/kestrove-nmh",
+  "type": "stdio",
+  "allowed_origins": ["chrome-extension://__CHROME_EXTENSION_ID__/"]
+}

native-messaging/app.kestrove.nmh.firefox.json

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+{
+  "name": "app.kestrove.nmh",
+  "description": "Kestrove native messaging host",
+  "path": "__INSTALL_DIR__/kestrove-nmh",
+  "type": "stdio",
+  "allowed_extensions": ["__FIREFOX_EXTENSION_ID__"]
+}