Add broken claude implementation, CI / CD testing & some other quality of life improvements

[eharris128]

Summary

• Add Claude Agent SDK framework adapter (claude_sdk_agent.py) with Progent policy enforcement via async callback
• Use latest gemini packages
• Add CI pipeline (.github/workflows/ci.yml)
• Add smoke tests and integration tests (test_policy_smoke.py, test_agent_integration.py)
• Add CLAUDE.md, SECURITY.md
• Ruff lint/format pass across the codebase
• Consolidate Claude SDK support classes into single file (matching other adapters)