chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347)

Summary

  - Adds CLAUDE.md at repo root with 14 terse code audit rules (always loaded, low token cost)
  - Adds pointer files for other AI tools: AGENTS.md (Codex), GEMINI.md, .github/COPILOT-INSTRUCTIONS.md (Copilot), .cursorrules (Cursor) — all redirect to CLAUDE.md as single source of truth
  - Gitignores /.claude so personal AI config isn't distributed
  - Moves Claude skills to dev-docs/claude-skills/ (opt-in, not auto-loaded)
  - Adds 14 dev-docs covering codebase conventions

  Code Audit Rules (in CLAUDE.md)

  1. LINQ tiered rules (Tier 1 free, Tier 2 warm, Tier 3 forbidden)
  2. No Console.WriteLine — use LogFactory.GetLogger()
  3. No concurrency primitives in game code
  4. No World.Mobiles/World.Items iteration
  5. Clean up refs in OnDelete()/OnAfterDelete()
  6. Cancel timers in OnDelete()/OnAfterDelete()
  7. STArrayPool<T>.Shared not ArrayPool<T>.Shared
  8. PooledRefList<T> not new List<T>() on hot paths
  9. Serialization: partial class, [Constructible], no serialized TimerExecutionToken
  10. No Task.Run/new Thread() in game code
  11. Never assume era — ask which expansion
  12. _camelCase fields, PascalCase properties/methods
  13. No empty gumps — use DisplayTo() pattern
  14. PropertyList string literals must be {} holes, cliloc-as-argument uses :#

.gitignore

@@ -39,6 +39,7 @@
 /.idea
 /.vs
 /.vscode
+/.claude
 
 .DS_Store