Add full convoy formula execution to gt formula run command:
- Parse formula file to extract legs, synthesis, and prompts
- Create convoy bead in town beads to track execution
- Create leg beads for each parallel leg with tracking relations
- Create synthesis bead with dependencies on all legs
- Sling each leg to a polecat with leg-specific context
- Support dry-run mode to preview execution
The implementation supports convoy-type formulas with parallel legs
and a synthesis step. Non-convoy formulas show manual execution steps.
(gt-574qn)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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