Q-W3 review follow-ups: golden hash literal test, CLAUDE.md wav_codec bullet, dead RecordedCapture field comment, makeUniqueTag residual note

src/core/capture/capture_realtime.h

@@ -114,6 +114,16 @@ struct RecordedCapture {
     std::vector<std::string> trackGuids;
 
     int    channelCount = 0;
+
+    // TEST-ONLY / dead in production (Q-W3 review follow-up): the shell no longer
+    // populates these five fields before calling sampleFromRecordedCapture — the
+    // finalize path (capture_realtime_finalize.cpp) leaves them at their defaults
+    // and instead calls the shared stampCaptureSample(result.sample, ...) right
+    // after, which writes Sample::sampleRate/captureTempo/captureTimeSigNum/
+    // captureTimeSigDenom/createdTimestamp directly, overwriting whatever
+    // sampleFromRecordedCapture set from these. Kept (not deleted) because the pure
+    // unit tests still construct/assert them directly; removing the fields is a
+    // struct-shape decision out of scope here.
     int    sampleRate   = 0;   // 0 when the project rate was unknown (as offline)
     double captureTempo = 0.0; // BPM at capture time (shell reads Master_GetTempo)
     // Time signature at capture start (L7 F1; shell reads TimeMap_GetTimeSigAtTime).