release(fdroid): v0.4.3 — fix self-hosted F-Droid publish (v2-only signing)

The self-hosted F-Droid repo (https://dzianisv.github.io/opencode-mobile/fdroid/repo)
has been stuck at v0.4.1 because publish-fdroid crashed in androguard parsing the
CI APK's v2+v3 signature block pair ('NoOverwriteDict' object has no attribute
'append'). Force v1+v2-only signing: gradle flags for local builds, plus a
deterministic apksigner re-sign step in the workflow (expo prebuild regenerates
build.gradle, so the workflow step is the real guarantee). Bump to v0.4.3 /
versionCode 5 so a fresh tag re-runs the publish with the verified bug fixes
(#10 scope fixes, send-error fix) included.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

android/app/build.gradle

@@ -94,8 +94,8 @@ android {
         applicationId 'cc.agentlabs.opencode'
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 4
-        versionName "0.4.2"
+        versionCode 5
+        versionName "0.4.3"
 
         buildConfigField "String", "REACT_NATIVE_RELEASE_LEVEL", "\"${findProperty('reactNativeReleaseLevel') ?: 'stable'}\""
     }
@@ -112,6 +112,16 @@ android {
                 storePassword System.getenv("RELEASE_STORE_PASSWORD")
                 keyAlias System.getenv("RELEASE_KEY_ALIAS")
                 keyPassword System.getenv("RELEASE_KEY_PASSWORD")
+                // Sign with v1+v2 only. A v2+v3 block pair crashes the androguard
+                // version fdroidserver uses ("'NoOverwriteDict' object has no
+                // attribute 'append'"), which broke the self-hosted F-Droid repo
+                // publish from v0.4.2 on. v1+v2 installs on all supported API levels
+                // and matches the known-good published APK. Re-enable v3 only once
+                // fdroidserver/androguard ships the fix.
+                enableV1Signing true
+                enableV2Signing true
+                enableV3Signing false
+                enableV4Signing false
             }
         }
     }