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/src/server/agent/llm-openai.ts

@@ -153,10 +153,14 @@ const manualTools = {
 /**
  * Get all tools (MCP + manual) for LLM
  * @param terminalTools - Optional custom terminal tools (per-session). If not provided, uses global singleton.
+ * @param agentTools - Optional agent tools (per-session).
  */
-export async function getAllTools(terminalTools?: Record<string, any>): Promise<Record<string, any>> {
+export async function getAllTools(
+  terminalTools?: Record<string, any>,
+  agentTools?: Record<string, any>
+): Promise<Record<string, any>> {
   if (terminalTools) {
-    // Use provided terminal tools (per-session) and merge with Playwright
+    // Use provided terminal tools (per-session) and merge with Playwright and agent tools
     const playwrightClient = await getPlaywrightMcpClient().catch((error) => {
       console.error("Failed to initialize Playwright MCP:", error);
       return null;
@@ -169,6 +173,7 @@ export async function getAllTools(terminalTools?: Record<string, any>): Promise<
     return {
       ...terminalTools,
       ...playwrightTools,
+      ...(agentTools || {}),
       ...manualTools,
     };
   }
@@ -177,6 +182,7 @@ export async function getAllTools(terminalTools?: Record<string, any>): Promise<
   const mcpTools = await getMcpTools();
   return {
     ...mcpTools,
+    ...(agentTools || {}),
     ...manualTools,
   };
 }