Steve Yegge ba17898365 Implement fanout gate: waits-for children aggregation (gt-8tmz.38) ...

- Add children-of(step-id) syntax for explicit spawner reference
- Add WaitsForSpec type and ParseWaitsFor() helper
- Update cook.go to create DepWaitsFor dependencies with metadata
- Infer spawner from first needs entry when using all-children
- Add validation tests for children-of() syntax
- Add unit tests for ParseWaitsFor()

This completes the Christmas Ornament aggregation pattern:
- survey-workers does for-each → creates N children
- aggregate waits-for children-of(survey-workers)

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-25 17:33:54 -08:00

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