feat: Add GitHub Actions CI for PR protection

- Add CI workflow with Python (ruff lint, security tests) and UI (ESLint, TypeScript, build) jobs
- Add ruff, mypy, pytest to requirements.txt
- Add pyproject.toml with ruff configuration
- Fix import sorting across Python files (ruff --fix)
- Fix test_security.py expectations to match actual security policy
- Remove invalid 'eof' command from ALLOWED_COMMANDS

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

autonomous_agent_demo.py

@@ -23,7 +23,6 @@ Example Usage:
 
 import argparse
 import asyncio
-import os
 from pathlib import Path
 
 from dotenv import load_dotenv
@@ -35,7 +34,6 @@ load_dotenv()
 from agent import run_autonomous_agent
 from registry import get_project_path
 
-
 # Configuration
 # DEFAULT_MODEL = "claude-sonnet-4-5-20250929"
 DEFAULT_MODEL = "claude-opus-4-5-20251101"