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

feat: Introduce `MCPClient` for multi-server MCP communication with mock support, update `gradio` dependency, and add logging verification scripts.

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

feat: Implement CredentialWatch agent with Gradio UI and MCP client for expiry sweep and interactive queries.

feat: add MCPClient for managing connections to MCP servers and modify app launch parameters.

feat: Introduce Gradio UI for interactive query and expiry sweep, add a multi-server MCP client, and simplify app startup to directly launch Gradio.

feat: Introduce `MCPClient` for multi-server communication and integrate with FastAPI lifespan events.

Clean commit for HF push