Q-W3: main.cpp → pointers+entry+dispatch via 4 capture hoists; one pure wav_codec RIFF owner; ICaptureBackend deleted; capture_realtime rename + finalize split; shared stampCaptureSample; makeUniqueTag gains monotonic counter (fixes same-second batch collisions). 60/60 green.

src/core/capture/capture_paths.h

@@ -34,37 +34,9 @@ struct BankPaths {
     std::string fileStem;       // <stem>                        (RENDER_PATTERN — REAPER appends the extension)
 };
 
-// Computes a deterministic FNV-1a 64-bit content hash over `len` bytes at `data`
-// and returns it as a 16-character lowercase hex string. Designed to fill
-// Sample::contentHash so the confirm-on-last-reference guardrail
-// (BankBook::hashReferencedElsewhere) can distinguish "no other bank holds this
-// file" from "another bank holds the same file." An empty buffer returns the bare
-// FNV-1a 64-bit offset basis in hex (a stable, non-empty sentinel that two empty
-// files would share, but real WAV files are never empty).
-std::string hashBytes(const std::uint8_t* data, std::size_t len);
-
-// WAV-aware content hash: hashes only the audio-defining content of a 32-bit-float
-// RIFF/WAVE file — the `fmt ` chunk body + the `data` chunk payload — skipping all
-// other RIFF chunks (e.g. `bext` origination timestamp, `iXML`, `LIST`/`INFO`, SMED).
-//
-// WHY: REAPER's offline renderer embeds render-varying metadata chunks (at minimum a
-// `bext` chunk containing the origination date/time) even when the format config blob
-// requests no BWF metadata. Two renders of identical audio therefore differ in those
-// bytes, making whole-file hashes diverge and preventing dedup collapse.
-//
-// DOMAIN SEPARATION: the FNV-1a input is prefixed with the tag byte 'W' (0x57) before
-// the fmt/data bytes are fed in, so a content hash can never equal a whole-file
-// hashBytes result for a different file of the same size.
-//
-// FALLBACK: if `bytes` does not parse as a valid RIFF/WAVE with both a `fmt ` and a
-// `data` chunk, the function falls back to whole-file hashBytes (no prefix tag) —
-// identical to calling hashBytes(bytes.data(), bytes.size()). This ensures that an
-// unrecognized or malformed file still gets a non-empty hash rather than silently
-// skipping dedup.
-//
-// Called by both capture commit paths (offline and realtime) in place of the raw
-// hashBytes call.
-std::string hashWavContent(const std::vector<std::uint8_t>& bytes);
+// NOTE (Q-W3, audit §4e): the content-identity hashes (hashBytes / hashWavContent)
+// moved to core/capture/wav_codec.{h,cpp} — the ONE pure owner of the WAV/RIFF byte
+// format — so this module holds path arithmetic only, with no RIFF chunk knowledge.
 
 // Normalizes a path to forward slashes and strips any trailing slash. Empty in
 // -> empty out. Pure string transform (does not consult the filesystem).