MCP Protocol endpoint

Model Context Protocol (MCP) endpoint for tool discovery and invocation.

This endpoint implements the MCP specification for:

• Tool listing (tools/list)
• Tool invocation (tools/call)
• Session management

Agents and workflows are exposed as MCP tools with names like:

• agent_coder - Execute the coder agent
• workflow_code_review - Run the code-review workflow
• get_workflow_run_status - Check workflow status