docs: restructure CLAUDE.md to consolidate team rules (#376)

- Add EXTREMELY-IMPORTANT skill invocation block at top
- Add comprehensive session initialization protocol
- Merge TDD/BDD enforcement details with examples
- Add complete 'Using Skills' guidance with flow diagram
- Add skill rationalizations table (red flags)
- Add persona-switching PR workflow (two-account pattern)
- Add session continuation protocol
- Add compliance checklists (before implementation/PR/merge)
- Add evidence requirements summary
- Update .gitignore to exclude CLAUDE.local.md

CLAUDE.local.md now contains only machine-specific configuration
(persona paths, account mappings, troubleshooting).

Closes #376

Author: mcj-coder

.gitignore

@@ -11,4 +11,5 @@ node_modules/
 
 # Local Claude settings
 .claude/settings.local.json
+CLAUDE.local.md
 .worktrees/