docs: add CLAUDE.md — agent development guidelines

- Core principles for autonomous agents with verification
- Checkpoint-based self-monitoring patterns
- Generalized agent workflow (no project-specific agents)
- Single source of truth in ~/clawd/claude-agents-skills/
- PM autonomy and cron job configuration
- Verification protocol to prevent hallucinations
- Together with CODING-CONVENTIONS.md, foundation for agent development

.gitignore

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+# Dependencies
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Build & dist
+dist/
+build/
+*.bundle.js
+*.bundle.css
+
+# Environment
+.env
+.env.local
+.env.*.local
+.env.production.local
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# OS
+Thumbs.db
+.DS_Store
+
+# Logs
+*.log
+logs/
+
+# Test coverage
+.coverage/
+coverage/
+
+# Python
+*.pyc
+__pycache__/
+*.py~
+
+# Staging
+/tmp/
+/staging-*/
+
+# Planning & Documentation (kept locally, not in repo)
+.planning/
+TODO.md
+./frontend/.planning/
+./frontend/tasks/
+./docs/plans/
+.claude/settings.local.json