Adds gt mail clear [target] command that:
- Clears all messages from an inbox
- Supports clearing your own inbox (no args) or another agent's
- Reports count of deleted messages
- Handles partial failures gracefully
Use case: Town quiescence - reset all inboxes across workers efficiently.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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