Measure real CPU VAD on complete frozen media pool

docs/SPEECH-VAD.md

@@ -2,7 +2,8 @@
 
 Research recorded 2026-10-13 against whisper.cpp **v1.9.5**, exact commit
 `d1be6fde11ac6e0407606b4e42fe72d34add8037`. A real-model CPU silence contract
-check has now passed; no media comparison, alignment experiment, product
+check and complete five-source VAD run have now passed; no gated ASR comparison,
+alignment experiment, product
 integration or default change has been performed. The
 corrected ungated ASR observations remain in [speech alignment](SPEECH-ALIGNMENT.md).
 The instrumental piano's large CPU cost and unrelated text motivate testing;
@@ -183,6 +184,38 @@ parameter table, catches native error-level logs, and checks probability frame
 coverage. This is a smoke test, not a speech-quality result or OS thread-count
 measurement. An independent complete media comparison remains necessary.
 
+## Complete frozen-pool VAD measurement
+
+The tracked `tools/speech-vad/run.py` verified every source hash and primary
+audio stream, decoded float PCM with full sample coverage, and ran the v6.2.0
+candidate over all five existing competitors. Raw probabilities/logs and both
+raw and source-intersected intervals are retained in ignored
+`.searchi/speech/vad-v6-results.json`, SHA-256
+`093be2005b57fe16a8f85161cc9da8966e70e2050cf19fa4122531e304dd70df`.
+Current diagnostic worker SHA-256:
+`28746d770ed470d13475d9474fcd37f28c38c39f27da09219bf9a15eef2adb19`.
+
+| Source | Intervals | Detected source seconds | Whole VAD process ms |
+| --- | ---: | ---: | ---: |
+| clip04 (speech) | 12 | 66.04 | 2002.7 |
+| music01 | 0 | 0 | 870.1 |
+| music02 | 0 | 0 | 160.1 |
+| sound01 | 0 | 0 | 57.7 |
+| sound02 | 0 | 0 | 108.3 |
+
+The first attempted run rejected finite float decoder overshoot above unity.
+That input contract was incorrect: float decoding can exceed unity without
+corruption. The wrapper now preserves finite samples without clipping and
+rejects nonfinite values. The failure log was retained and no reduced pool
+was scored. All three native contracts passed again with the corrected build;
+four mapping regressions cover centiseconds, source origin, padded tails and
+invalid intervals. Segmentation parameters and model remained frozen.
+
+This small VAD-only result supports testing gated ASR next. It does not establish
+speech recall, transcript correctness, timestamp accuracy, retrieval improvement
+or a general music policy. No production gate was added and original Google
+audio retrieval remains unchanged.
+
 Open gates: actual one-thread audit, detection/recognition
 comparison, ordinary and DTW timestamp regression, independent held-out quality,
 background starvation/cancellation/crash recovery, packaging/license review,