P0 bug: Crew workers were being killed every 5 minutes due to stale
LIFECYCLE messages from days ago being reprocessed on each heartbeat.
Root cause: closeMessage() was only called after successful action
execution. Failed actions left messages in inbox to be reprocessed.
Fix: "Claim then execute" pattern - delete message FIRST, before
attempting the action. This guarantees stale messages are cleaned up
regardless of action outcome. If a lifecycle action is needed, the
sender must re-request.
Also improved closeMessage() to capture and log actual error output.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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