ci: ARM Android runners, slimmer APK artifacts, Renovate-pinned tool versions (#1733)

.github/workflows/artifact-comment.yml

@@ -18,7 +18,7 @@ jobs:
   comment-artifacts:
     if: github.event_name == 'workflow_dispatch' || github.event_name == 'pull_request' || (github.event_name == 'workflow_run' && github.event.workflow_run.event == 'pull_request')
     name: 📦 Post Build Artifacts
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
       pull-requests: write
@@ -451,6 +451,20 @@ jobs:
               commentBody += `- **Android APK**: Download and install directly on your device (enable "Install from unknown sources")\n`;
               commentBody += `- **iOS IPA**: Install using [AltStore](https://altstore.io/), [Sideloadly](https://sideloadly.io/), or Xcode\n\n`;
               commentBody += `> ⚠️ **Note**: Artifacts expire in 7 days from build date\n\n`;
+
+              // Collapsible rundown of the build optimisations + what each
+              // artifact actually installs on, so testers grab the right file.
+              commentBody += `<details>\n`;
+              commentBody += `<summary>📦 Build details &amp; device compatibility</summary>\n\n`;
+              commentBody += `These CI builds are trimmed for size and speed. What that means for installing them:\n\n`;
+              commentBody += `| Artifact | Architectures | Installs on |\n`;
+              commentBody += `|---|---|---|\n`;
+              commentBody += `| 🤖 Android Phone APK | \`arm64-v8a\` | Every 64-bit Android phone (all since ~2017). **Not** an x86_64 emulator or a 32-bit device. |\n`;
+              commentBody += `| 📺 Android TV APK | \`arm64-v8a\` + \`armeabi-v7a\` | Modern boxes **and** older / cheap 32-bit Android TV sticks. No x86_64. |\n`;
+              commentBody += `| 🍎 iOS / tvOS IPA | \`arm64\` | iPhone / Apple TV (all current devices). |\n\n`;
+              commentBody += `**Why no x86_64?** That slice only runs on Android emulators / Chromebooks, never a real phone or TV box — dropping it shrinks the APK and speeds up the build. Local \`bun run android\` is unaffected (it still builds x86_64 from \`app.json\`).\n\n`;
+              commentBody += `**Runners:** Android on \`ubuntu-26.04\`; iOS / tvOS on Apple Silicon (\`macos-26\`). The size/speed win comes from the ABI trim above, not the runner.\n`;
+              commentBody += `</details>\n\n`;
             } else {
               commentBody += `⏳ **Builds are starting up...** This comment will update automatically as each build completes.\n\n`;
             }