[Naveen Chatlapalli (1aifanatic)]

Fixes #1051.

Post-processing messages already carry a run ID, but the worker and ATIF handler previously updated the request by document ID alone. A stale message could therefore mark a retried attempt as post-processed or write its ATIF URL onto the new attempt.

The worker now claims and updates only the completed run._id named in the message. The ATIF handler reads turns and writes atifUrl under the same attempt filter. Stale messages are discarded before their handler runs; if a retry replaces the run during processing, the worker skips the completion stamp and report trigger.

Validation: 9 focused post-processor/ATIF tests passed; pnpm --filter telemetry build and pnpm --filter post-processor build passed; git diff --check passed. The repository's post-processor lint script could not run because eslint is not installed in this checkout.