Merge branch 'v0.9.0rc' into feat/subagents-skills

Resolved conflict in agent-service.ts by keeping both:
- agents parameter for custom subagents (from our branch)
- thinkingLevel and reasoningEffort parameters (from v0.9.0rc)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/src/lib/http-api-client.ts

@@ -372,7 +372,13 @@ export const verifySession = async (): Promise<boolean> => {
     'Content-Type': 'application/json',
   };
 
-  // Add session token header if available
+  // Electron mode: use API key header
+  const apiKey = getApiKey();
+  if (apiKey) {
+    headers['X-API-Key'] = apiKey;
+  }
+
+  // Add session token header if available (web mode)
   const sessionToken = getSessionToken();
   if (sessionToken) {
     headers['X-Session-Token'] = sessionToken;