- bd-hr39: Add `needs` field to Step as alias for depends_on. Converts
to blocking dependencies between sibling steps during cooking.
- bd-j4cr: Add `waits_for` field to Step. Values: all-children or
any-children. Preserved as gate:<value> label during cooking.
- bd-47qx: Add --prefix flag to bd cook command to prepend a prefix
to proto IDs, enabling use of project prefixes like gt-.
Includes validation, dry-run output, and comprehensive tests.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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