launch: pre-flight accuracy pass on Show HN + Reddit copy

Fixed claims a technical audience would catch:
- Android build is Gradle (assembleRelease/bundleRelease), NOT EAS — EAS is only in
  the unshipped iOS workflow. Changed 'GitHub Actions + EAS' -> 'GitHub Actions (Gradle)'.
- App is Android-only: dropped 'iOS Keychain', kept 'Android Keystore'.
- Diff viewer renders into native views (ScrollView), not a FlatList.

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

distribution/launch/reddit.md

@@ -20,11 +20,11 @@ opencode is a CLI tool that runs an AI coding agent (Claude, GPT-4, Gemini — y
 
 The interesting engineering bits:
 - SSE streaming over `EventSource` polyfill (React Native has no native EventSource — the web polyfill works but needs patching for Android's OkHttp redirect behavior)
-- Diff viewer is a custom line-level parser rendering into a FlatList, not a WebView — keeps it snappy and allows proper dark-mode theming
+- Diff viewer is a custom line-level parser rendering into native views, not a WebView — keeps it snappy and allows proper dark-mode theming
 - Tool call approval is a bottom sheet that interrupts the stream and waits for user input before the agent proceeds
 - Biometric auth (`expo-local-authentication`) gates both app open and individual message sends
 - Credentials in Android Keystore via `expo-secure-store`
-- Built with Expo SDK 54, TypeScript, signed AAB on every tag via GitHub Actions + EAS
+- Built with Expo SDK 54, TypeScript, signed APK + AAB on every tag via GitHub Actions (Gradle)
 
 **Stack:** React Native / Expo, TypeScript, React Query for server state, Zustand for local state, Sentry for crash reporting (opt-in, off by default).