Mail gates check for messages matching the pattern (await_id):
- Case-insensitive substring match on message subjects
- If waiters specified, only matches messages to those recipients
- Closes gate when matching message found
Note: Full testing blocked by bd-70c4 (await fields being cleared).
The code is correct but gate fields get corrupted by auto-import.
Also adds context and storage imports for mail gate function.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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