Implement MoleculeCatalog for loading molecules from multiple sources:
1. Built-in molecules (shipped with the gt binary)
2. Town-level: <town>/.beads/molecules.jsonl
3. Rig-level: <rig>/.beads/molecules.jsonl
4. Project-level: .beads/molecules.jsonl
Changes:
- Add internal/beads/catalog.go with MoleculeCatalog type
- Update gt molecule list to show source (builtin, town, rig, project, database)
- Update gt molecule show to check catalog first, then database
- Update gt molecule instantiate to check catalog first
- Add gt molecule export command to export built-in molecules to JSONL
- Add --catalog and --db flags to gt molecule list
The catalog enables organizations to share molecule templates
independently of work item tracking, and allows customization
at different levels of the workspace hierarchy.
Closes gt-0ei3.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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