Implements the release subcommand to allow workers to release claimed
messages back to their queues. The command:
- Verifies the caller owns the claimed message
- Validates the message has a queue label
- Returns the message to open status with queue assignee
Includes TestMailReleaseValidation unit tests.
(gt-guyt5)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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