- Add sessionDelete action to handle deletion of sessions and all related data
- Delete session messages, usage reports, and access keys in proper order
- Add delete-session event type to eventRouter for real-time notifications
- Add DELETE /v1/sessions/:sessionId endpoint with ownership verification
- Send socket notification to all user connections after successful deletion
- Add idempotency rule to CLAUDE.md for API operations
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Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>