Task results are now coordinator-owned artifacts end to end.
- domain.Task carries ResultArtifactID instead of ResultURI/ResultSHA256;
CompleteWith and its idempotency key are keyed on the artifact id.
- CompleteTask verifies the referenced artifact was stored for this exact
task (rule 10): a worker cannot finish task B with task A's artifact, nor
name an id that isn't a partial_result. Mismatch → 409.
- POST /tasks/{id}/result takes {result:{artifact_id,...}}; ListResults and
ResultManifest follow.
- migration 0004 drops result_uri/result_sha256 and requires a completed task
to reference its result_artifact_id.
- smoke and requests.http exercise upload → complete-by-id → replay → conflict.
Efremenko Arhip
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