feat: add conversation management, persistence, and mobile app spec

Major enhancements to voice assistant with conversation persistence
and mobile app planning:

- Add conversation management with multiple active conversations
- Implement conversation persistence (save/load from disk)
- Add conversation selector UI for switching between conversations
- Enhance agent prompt with per-conversation tmux sessions
- Add mobile app technical specification (React Native + Expo)
- Improve UI with active processes view and agent stream
- Add ACP (Agent Control Protocol) server implementation

Mobile spec details:
- React Native with Expo SDK 54+
- NativeWind v5 for styling
- Share Zod schemas/types from server
- Android in-call experience (InCallManager)
- Direct WebSocket connection via Tailscale
- Same audio quality as web prototype

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

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

packages/voice-assistant/scripts/process-conversation.ts

@@ -5,7 +5,7 @@ import { standardizePrompt } from "ai/internal";
 async function processConversation() {
   try {
     const conversationPath =
-      ".conversations/ce44c79a-0689-4210-8e00-72c0a627406d-2.json";
+      ".debug.conversations/ce44c79a-0689-4210-8e00-72c0a627406d-2.json";
 
     console.log("Loading conversation from:", conversationPath);