feat: Add validation action and orchestrator for CCW Loop

- Implemented the VALIDATE action to run tests, check coverage, and generate reports.
- Created orchestrator for managing CCW Loop execution using Codex subagent pattern.
- Defined state schema for unified loop state management.
- Updated action catalog with new actions and their specifications.
- Enhanced CLI and issue routes to support new features and data structures.
- Improved documentation for Codex subagent design principles and action flow.

ccw/src/core/routes/cli-routes.ts

@@ -302,7 +302,7 @@ export async function handleCliRoutes(ctx: RouteContext): Promise<boolean> {
     if (req.method === 'PUT') {
       handlePostRequest(req, res, async (body: unknown) => {
         try {
-          const updates = body as { enabled?: boolean; primaryModel?: string; secondaryModel?: string; tags?: string[] };
+          const updates = body as { enabled?: boolean; primaryModel?: string; secondaryModel?: string; tags?: string[]; envFile?: string | null };
           const updated = updateToolConfig(initialPath, tool, updates);
 
           // Broadcast config updated event