refactor: split builtin_molecules.go into category files (gt-nmtp)
Split 1620-line file into 4 organized files:
- builtin_molecules.go (77 lines) - type, registry, seeder
- molecules_patrol.go (567 lines) - Deacon, Witness, Refinery patrol
- molecules_work.go (446 lines) - EngineerInBox, QuickFix, Research, PolecatWork, ReadyWork
- molecules_session.go (545 lines) - CrewSession, PolecatSession, Bootstrap, VersionBump, InstallGoBinary
Benefits:
- Easier to find/edit specific molecules
- Smaller diffs on changes
- Clear categorization by purpose
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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