feat: Implement interactive query and expiry sweep agents with a Gradio UI, add a Hugging Face pre-push hook, and refine .gitignore.

feat: Implement interactive query agent with MCP client and Gradio UI, and add verification script.

feat: Implement CredentialWatch agent with MCP client, main entry point, interactive query agent, and various debugging utilities.

feat: introduce common agent state definitions and update README metadata.

Clean commit for HF push