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

android/app/build.gradle

@@ -94,8 +94,8 @@ android {
         applicationId 'cc.agentlabs.opencode'
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 6
-        versionName "0.4.4"
+        versionCode 32
+        versionName "0.4.5"
 
         buildConfigField "String", "REACT_NATIVE_RELEASE_LEVEL", "\"${findProperty('reactNativeReleaseLevel') ?: 'stable'}\""
     }