fix: resolve session resumption issue by storing Claude's internal session ID

- Add discriminated union for agent options with proper type (claude)
- Store Claude's internal session ID separately from ACP session ID
- Use Zod schema validation for persisted agents
- Use correct session ID when resuming agents (Claude ID for Claude agents)
- Update to @boudra/claude-code-acp@0.8.1 which extracts Claude session ID

packages/server/agents.json

@@ -1,9 +0,0 @@
-[
-  {
-    "id": "bcc0019c-9293-4235-adb7-921f8e7d67eb",
-    "title": "Fix Real-time Footer Spacing",
-    "sessionId": "019a1575-706b-73fc-8955-d2c7b524e707",
-    "createdAt": "2025-10-24T09:03:28.577Z",
-    "cwd": "/Users/moboudra/dev/voice-dev"
-  }
-]