feat: install Frank v6 modular AI assistant system
- Add Frank v6 core personality and base commands
- Install 7 reasoning skills (CRAFT, CoT, ToT, RAG, Markdown, Mermaid, Advanced Reasoning)
- Install 5 specialties (DevOps, ITIL, Data Analysis, Prompt Engineering, SCCM)
- Update copilot-instructions.md with v6 integration guide
- Add comprehensive architecture documentation
- Migrate style.mermaid.instructions.md from instructions/ to skills/
- Remove deprecated .github/instructions/ files (migrated to skills/)
- Remove obsolete create-commit.msg.prompt.md
nathan
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