feat(claude): Add testing, documentation rules and project hooks

- rules/testing.md: TDD workflow for Go and Python
- rules/documentation.md: Auto-documentation guidelines
- plans/embedding-service-separation.md: Migration plan
- settings.json: Post-edit hooks for docs/tests validation
- .gitignore: Exclude settings.local.json (contains API keys)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,145 @@
+# ============================================
+# BreakPilot PWA - Git Ignore
+# ============================================
+
+# Environment files (keep examples only)
+.env
+.env.local
+*.env.local
+
+# Keep examples and environment templates
+!.env.example
+!.env.dev
+!.env.staging
+# .env.prod should NOT be in repo (contains production secrets)
+
+# ============================================
+# Python
+# ============================================
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+venv/
+ENV/
+.venv/
+*.egg-info/
+.eggs/
+*.egg
+.pytest_cache/
+htmlcov/
+.coverage
+.coverage.*
+coverage.xml
+*.cover
+
+# ============================================
+# Node.js
+# ============================================
+node_modules/
+.next/
+out/
+dist/
+build/
+.npm
+.yarn-integrity
+*.tsbuildinfo
+
+# ============================================
+# Go
+# ============================================
+*.exe
+*.exe~
+*.dll
+*.dylib
+*.test
+*.out
+vendor/
+
+# ============================================
+# Docker
+# ============================================
+# Don't ignore docker-compose files
+# Ignore volume data if mounted locally
+backups/
+*.sql.gz
+*.sql
+
+# ============================================
+# IDE & Editors
+# ============================================
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+.project
+.classpath
+.settings/
+*.sublime-workspace
+*.sublime-project
+
+# ============================================
+# OS Files
+# ============================================
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# ============================================
+# Secrets & Credentials
+# ============================================
+secrets/
+*.pem
+*.key
+*.crt
+*.p12
+*.pfx
+credentials.json
+service-account.json
+
+# ============================================
+# Logs
+# ============================================
+*.log
+logs/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# ============================================
+# Build Artifacts
+# ============================================
+*.zip
+*.tar.gz
+*.rar
+
+# ============================================
+# Temporary Files
+# ============================================
+tmp/
+temp/
+*.tmp
+*.temp
+
+# ============================================
+# Test Results
+# ============================================
+test-results/
+playwright-report/
+coverage/
+
+# ============================================
+# ML Models (large files)
+# ============================================
+*.pt
+*.pth
+*.onnx
+*.safetensors
+models/
+.claude/settings.local.json