The --notify flag on gt convoy create was captured but never used.
This fix:
1. Stores the notify address in a bd slot when convoy is created
2. Adds 'gt convoy notify <convoy-id>' command that:
- Reads the notify slot
- Sends mail to the configured address with convoy completion details
- Does nothing gracefully if no notification was configured
The convoy-cleanup formula can now call 'gt convoy notify {{convoy}}'
to trigger the configured notification when a convoy completes.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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