Publish first usable Windows release instructions and validation

docs/MEDIA-QUALITY.md

@@ -92,6 +92,41 @@ Measured hybrid p95 was **146.83 ms** on this run. [Recorded output](../fixtures
 
 ## Scoring and release gates
 
+### Local recognized-speech supplement: actual Google diagnostic
+
+A subsequent internal experiment transcribed the unchanged NASA, piano, violin,
+bark and roaring-effect sources locally, then ranked actual recognized passages
+with Google EmbeddingGemma 2 on CPU, one thread. The base candidate supplied all
+30 valid segments from all five sources; music descriptions and hallucinated
+words remained competitors. Exact cosine ranking over source-preserving Google
+tokenizer windows, with a maximum per original segment, found the right file for
+**8/8** frozen NASA queries, but achieved **4/8 strict timestamp start hits** and
+**6/8 segment-overlap hits**. The Moon statement was merged into a segment starting
+at zero; the orange-soil exchange was missing. Funding and Mars passage starts
+passed their independent intervals.
+
+This is a direct recognized-text retrieval diagnostic, **not the production
+ANN/hybrid raw-audio pipeline**. The older production 0/8 point-hit result and
+these 4/8 hits are not equivalent head-to-head measurements and cannot establish
+a deployed improvement. The tiny paired English/German query set addresses four
+topics in one English recording; German speech and general ASR quality remain
+unverified. No model default, calibrated confidence or improved rating follows.
+
+The small candidate's Google diagnostic completed but excluded two invalid ASR
+timestamp windows (piano tail and bark), marking
+`quality_score_eligible=false`. Its reduced competitor pool receives **no
+accepted numeric quality score**. The base score report SHA is
+`8f92c8eeed41db7e78be0e188500e441d53b4fa49fa8c0353a77df74643ce895`;
+actual Google ranking reports are SHA
+`2fbc860f992c3ec561f54137e30744b00265455792e360010ab1fc78ab25173a`
+(base) and
+`aca99d36b3bdf013b1a1074c33f7232de1c1b79af62d00236d53267ce510c9c1`
+(small). Raw recognized text remains ignored. See
+[speech alignment evidence](SPEECH-ALIGNMENT.md) for worker/model provenance,
+corrected decoder validation, measured transcription cost and explicit failures.
+Production integration, speech gating/alignment and an equivalent pipeline rerun
+remain open; the experimental media self-rating stays **4/10**.
+
 Report recall@1/@5, MRR, language/type breakdowns, segment-overlap hits, precise timestamp point hits, and failure categories. No-answer return rate is distinct from positive recall. Do not invent an arbitrary cosine rejection threshold from these results; calibrate on a separate development set, then validate on held-out negatives.
 
 Self-rating rubric is declared before scores: **1–2/10** broken core retrieval; **3–4/10** experimental retrieval with missing essential capabilities or unvalidated abstention/metadata; **5–6/10** useful limited beta after independent basic retrieval/filter/metadata checks; **7–8/10** strong pilot with high recall and timestamp quality on representative corpora; **9–10/10** requires production release evidence across all operating systems, large representative libraries, calibrated no-answer behavior, and complete lifecycle/security/resource verification. A small diagnostic alone cannot justify a production score.