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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 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>