core: clang-format pass against the landed root .clang-format

Pure formatting, no behaviour change. PKG landed .clang-format (Google
base, 4-space indent, 100 cols); this brings util/ and the test harness
into conformance so `clang-format --dry-run -Werror` is clean. Build and
all six test binaries unchanged and green.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01HPPSGhiArbvQgwC2DNiURS

core/tests/util/log_test.cpp

@@ -48,8 +48,8 @@ VT_TEST(log_forwards_to_sink_with_format) {
 VT_TEST(log_level_filter_skips_below_min) {
     SinkGuard g;
     auto count = std::make_shared<int>(0);
-    vdm::set_log_sink(std::make_shared<CallbackSink>(
-        [count](const LogRecord &) { ++*count; }, LogLevel::warn));
+    vdm::set_log_sink(
+        std::make_shared<CallbackSink>([count](const LogRecord &) { ++*count; }, LogLevel::warn));
 
     VDM_LOG_DEBUG("x", "no");
     VDM_LOG_INFO("x", "no");