docs: add AI Traceability & Attribution guide
Comprehensive documentation on AI code attribution and disclosure:
- New guide: guide/ai-traceability.md (~640 lines)
- LLVM "Human-in-the-Loop" policy (Assisted-by trailer)
- Ghostty mandatory disclosure pattern
- Fedora contributor accountability framework
- git-ai tool documentation
- PromptPwnd security vulnerability
- Four-level disclosure spectrum
- Implementation guides (solo, team, enterprise)
- Templates: examples/config/
- CONTRIBUTING-ai-disclosure.md
- PULL_REQUEST_TEMPLATE-ai.md
- Cross-references added to:
- ultimate-guide.md (after Co-Authored-By section)
- learning-with-ai.md (after Vibe Coding Trap)
- security-hardening.md (See Also)
- guide/README.md (table of contents)
- reference.yaml: 14 new entries for AI traceability topics
Source: Vibe coding needs git blame (Piotr Migdał, Jan 2026)
+ Perplexity research on LLVM, Ghostty, Fedora policies
Co-Authored-By: Claude <noreply@anthropic.com>
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