suppress seed-equivalence (the seed's own master) - #12
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the day-7 eval surfaced (and reproduced) a seed recommending a *different master of itself* at #1 — take five → "take five — dave brubeck" at audio cosine 0.988, but a distinct mbid + deezer track, so the identity (mbid/ptid) dedup can't catch it. _build_results now drops an audio-scored result whose raw audio cosine ≥ SEED_EQUIVALENCE_AUDIO_MIN (0.98) AND whose title token_set-matches the seed (≥ SEED_EQUIVALENCE_TITLE_MIN, 0.90), recording its keys first so cultural backfill can't re-add it. a live/acoustic version scores lower audio and survives — the and-gate keeps the heuristic from collapsing the distinct recordings the product exists to surface. audio-path only (no audio score in cultural-only mode — the documented gap); thresholds are env knobs for eval calibration. validated on the full 19-seed benchmark: only the two take-five seeds changed (self-rec gone, genuine jazz promoted), 17/19 untouched, and "take five" is still correctly recommended for the so-what seed (different seed title → not suppressed). regression in test_pipeline.py.
flips the day-7 follow-up to ✓ — _build_results drops the seed's own master (audio ≥ 0.98 + title match), validated surgical on the full benchmark (only the take-five seeds changed, 17/19 untouched).
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Closes the Day-7 eval follow-up: a seed could recommend a different master of itself at #1 — Take Five → "Take Five — Dave Brubeck" at audio cosine 0.988, but a distinct MBID + Deezer track, so the identity (mbid/ptid) dedup couldn't catch it. _build_results now drops an audio-scored result whose raw audio cosine ≥ 0.98 (env SEED_EQUIVALENCE_AUDIO_MIN) AND whose title token_set-matches the seed (≥ 0.90), recording its keys first so cultural backfill can't re-add it — a live/acoustic version scores lower audio and survives, so the distinct recordings the product exists to surface aren't collapsed. Validated by re-running the full 19-seed benchmark with the heuristic active: surgical — only the two Take Five seeds changed (self-rec gone, genuine jazz promoted), 17/19 untouched, and "Take Five" is still correctly recommended for the So What seed.