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.

app/electron/services/feature-executor.js

@@ -397,6 +397,7 @@ class FeatureExecutor {
         
         // Use Codex provider for OpenAI models
         console.log(`[FeatureExecutor] Using Codex provider for model: ${modelString}`);
+        // Pass MCP server config to Codex provider so it can configure Codex CLI TOML
         currentQuery = provider.executeQuery({
           prompt,
           model: modelString,
@@ -404,6 +405,9 @@ class FeatureExecutor {
           systemPrompt: promptBuilder.getCodingPrompt(),
           maxTurns: 20, // Codex CLI typically uses fewer turns
           allowedTools: options.allowedTools,
+          mcpServers: {
+            "automaker-tools": featureToolsServer
+          },
           abortController: abortController,
           env: {
             OPENAI_API_KEY: process.env.OPENAI_API_KEY