Adds 'waits-for' dependency type for dynamic molecule bonding:
- DepWaitsFor blocks an issue until spawner's children are closed
- Two gate types: all-children (wait for all) or any-children (first)
- Updated blocked_cache.go CTE to handle waits-for dependencies
- Added --waits-for and --waits-for-gate flags to bd create command
- Added WaitsForMeta struct for gate metadata storage
- Full test coverage for all gate types and dynamic child scenarios
This enables patrol molecules to wait for dynamically-bonded arms to
complete before proceeding (Christmas Ornament pattern).
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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