fix(launch): Expo SDK 52->54 in HN/Reddit copy; add reply-flow E2E evidence; version refs

- Launch posts claimed Expo SDK 52 but app is on SDK 54 (factual accuracy
  before public posting — HN/Reddit devs check this)
- docs/qa/REPLY-FLOW-E2E-2026-06-08.md: verified send->streaming reply works
  against the live opencode server via app-identical sdk.ts calls (free model);
  closes the 'opencode can't reply in CI' residual at the data-contract level
- owner-submissions.md: 0.4.3 -> 0.4.4

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

distribution/launch/show-hn.md

@@ -24,7 +24,7 @@ I run long opencode sessions that outlast my desk time. I wanted to check in fro
 
 **How it's built**
 
-- React Native + Expo SDK 52, TypeScript throughout
+- React Native + Expo SDK 54, TypeScript throughout
 - SSE streaming via `EventSource` polyfill (React Native lacks a native one)
 - Diff rendering with a custom line-level parser; no WebView
 - Biometric auth via `expo-local-authentication` gates the app and individual sends