feat(mcp): implement MCP server integration for Codex CLI

- Added a new CodexConfigManager to manage TOML configuration for MCP server settings.
- Introduced MCP server IPC handlers in main.js to facilitate feature status updates.
- Enhanced CodexExecutor and FeatureExecutor to configure and utilize MCP server settings.
- Created a standalone MCP server script for JSON-RPC communication with Codex CLI.
- Updated model-provider to pass MCP server configuration to the executor.

These changes enable seamless integration of the MCP server with Codex CLI, improving feature management and execution capabilities.

.automaker/feature_list.json

@@ -192,7 +192,7 @@
     "category": "Settings",
     "description": "Add claude and codex to the left sidebar of settings so its will scroll to thoes sections as well",
     "steps": [],
-    "status": "waiting_approval",
+    "status": "verified",
     "startedAt": "2025-12-10T09:32:31.638Z",
     "imagePaths": [
       {