Implements the synthesis step that combines leg outputs into a final
deliverable for convoy workflows:
- `gt synthesis start <convoy-id>` - Start synthesis after verifying
all legs are complete, collecting outputs, and slinging to polecat
- `gt synthesis status <convoy-id>` - Show synthesis readiness and
leg completion status
- `gt synthesis close <convoy-id>` - Close convoy after synthesis
Key features:
- Collects leg outputs from formula-defined paths (e.g., findings.md)
- Creates synthesis bead with combined context from all leg outputs
- Integrates with formula.toml synthesis configuration
- Provides TriggerSynthesisIfReady() for automated synthesis trigger
- Adds SynthesisFields struct for tracking synthesis state in beads
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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