Allows agents to self-pin work from mail messages. The command:
1. Reads a mail message by ID
2. Extracts molecule ID from the body (attached_molecule:, molecule_id:, etc.)
3. Attaches the molecule to the agent's pinned bead (hook)
4. Marks the mail as read
Includes unit tests for the molecule ID extraction logic.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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