refactor(guide): restructure guide/ into thematic subdirectories
Reorganize 22 guide files from a flat directory into 5 thematic subdirs:
- core/ (architecture, methodologies, known-issues, claude-code-releases, visual-reference)
- security/ (security-hardening, sandbox-isolation, sandbox-native, production-safety, data-privacy)
- ecosystem/ (ai-ecosystem, mcp-servers-ecosystem, third-party-tools, remarkable-ai)
- roles/ (ai-roles, adoption-approaches, learning-with-ai, agent-evaluation)
- ops/ (devops-sre, observability, ai-traceability)
All internal links updated across ~50 files (ultimate-guide.md, workflows/,
diagrams/, README.md, docs/, tools/, examples/, machine-readable/).
Also: merge search-tools-cheatsheet.md into cheatsheet.md, rewrite guide/README.md
with H2 grouped sections, update CLAUDE.md repository structure.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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