Comprehensive prompt system documentation including:
- Full PGT prompt inventory (roles, mail, spawn, lifecycle)
- Gap analysis (Witness has no prompts!)
- GGT architecture recommendations (directory structure, template engine)
- Complete Witness prompt design (new role!)
- Implementation plan with phases
Related: gt-59p
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
