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Release-hardening pass (PLAN.md §9 M6, §10, §12). No architecture, data-flow, or endpoint changes; the app remains a pure API client. App icons (default brand assets): - New gateway-medallion launcher icon set (all densities, adaptive fg/bg, round, Play Store icon) + an RG notification icon staged for M7 push. - Replace the Image Asset wizard's default green-grid adaptive background with the deep-indigo brand fill (@color/ic_launcher_background #1B1033); recomposite the legacy square/round webps and the 512 Play icon over indigo so the whole set is coherent (the green never shipped). Restore the SPDX headers the wizard stripped; drop the orphaned placeholder foreground vector. No <monochrome> layer — the full-colour medallion has no clean silhouette, so themed mode falls back to the standard icon rather than a tinted blob. Version-mismatch guard (§3): - The connect probe now refuses a Runic Gateway backend whose API version this build can't speak (e.g. a future v2) with a clear "app out of date" message, instead of mis-rendering; lenient on a blank api (older backend). Decision logic extracted to a pure ConnectionRepository.evaluateVersion() with unit tests. Release build hardening (§7, §12): - Enable R8 full-mode minify + resource shrink for release (~31 MB debug -> 4.2 MB signed release). ProGuard keep-rules for kotlinx.serialization serializers + our wire DTOs, Retrofit service interfaces, and a -dontwarn for Tink's compile-only Error Prone annotations (EncryptedSharedPreferences). - Release signingConfig reads keystore material from a gitignored keystore.properties or env vars; absent -> unsigned (debug + PR gate unaffected). Keystore never in repo. - versionName/versionCode overridable via -P so the release tag + CI run number drive them (§10). CI: - release.yml: on a `v*` tag, build a SIGNED release APK (keystore from a base64 Gitea secret) and attach it + SHA256SUMS to a Gitea release; workflow_dispatch is a signing dry run. Mirrors pr-checks.yml's self-hosted-runner handling (apt JDK 17, explicit sdkmanager, in-step chmod +x gradlew). Co-Authored-By: Claude <noreply@anthropic.com>