chore: bump versionCode to 32 (v0.4.5), add goal.md execution plan

- versionCode 6 → 32 to supersede existing internal track release
- versionName 0.4.4 → 0.4.5
- goal.md: add current_mission section with blocking checklist and execution plan

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01No3k1AEioE4PNUZg12TxQo

app.json

@@ -34,7 +34,7 @@
     },
     "android": {
       "package": "cc.agentlabs.opencode",
-      "versionCode": 6,
+      "versionCode": 32,
       "usesCleartextTraffic": true,
       "adaptiveIcon": {
         "foregroundImage": "./assets/adaptive-icon.png",