Add mobile services, web proxy, and Gemma4 agent loop

- Mobile: add push notification and calendar sync services with full test suite (calendar, eventStore, notifications,
  screens)
- Mobile: add EAS build config and Jest setup
- Web: add API proxy, update useDestinationStation/useJourneys hooks, add middleware tests
- Web: update next.config and rebuild
- Agent: add Gemma4-based agent loop (agent_base, ttl_agent, ts_agent)
- Docs: add privacy policy, post-MVP plan, and aider rules

apps/web/next.config.ts

@@ -3,6 +3,20 @@ import type { NextConfig } from "next";
 const nextConfig: NextConfig = {
   output: "standalone",
   serverExternalPackages: ["node-ical"],
+  env: {
+    CORS_ALLOWED_ORIGINS: process.env.CORS_ALLOWED_ORIGINS,
+    DEPLOYMENT_URL: process.env.DEPLOYMENT_URL,
+  },
 };
 
+// Validate environment variables at build time
+if (process.env.NODE_ENV === 'production') {
+  if (!process.env.CORS_ALLOWED_ORIGINS) {
+    throw new Error('Missing CORS_ALLOWED_ORIGINS environment variable in production');
+  }
+  if (!process.env.DEPLOYMENT_URL) {
+    throw new Error('Missing DEPLOYMENT_URL environment variable in production');
+  }
+}
+
 export default nextConfig;