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

.gitignore

@@ -27,4 +27,14 @@ npm-debug.log*
 # typescript
 *.tsbuildinfo
 next-env.d.ts
-agent_loop/
+.aider*
+
+# agent loop generated output
+agent_loop/logs/
+agent_loop/runs/
+agent_loop/__pycache__/
+logs/
+runs/
+
+# next.js build output (apps)
+apps/web/.next/