Added molecule workflow integration to Gas Town:
1. spawn.go: MoleculeContext in work assignment mail
- Shows step N/M and molecule ID in subject
- Includes molecule workflow instructions
- Guides polecat through DAG execution
2. prime.go: outputMoleculeContext()
- Detects if in-progress issue is a molecule step
- Shows molecule progress and next steps
- Displays molecule work loop instructions
3. molecule.go: 'gt molecule progress' command
- Shows execution progress for molecule root
- Displays done/in-progress/ready/blocked steps
- Progress bar and completion percentage
- JSON output for Witness automation
This enables polecats to work through molecule DAGs:
- Receive molecule-aware work assignments
- See context in gt prime output
- Follow DAG with 'bd ready --parent <root>'
- Witness can monitor with 'gt molecule progress'
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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