[jakepurple13]

Summary

Turns on R8 for the Android release build and adds baseline and startup profiles that are generated on CI. Also updates AGP and all libraries, since AGP 9 is needed for the profile tooling.

Results (release build, measured on a physical S6003L, API 31)

	Before	After
Release APK	19.8 MB	4.86 MB (−75%)
Dex (uncompressed)	56.3 MB	3.8 MB

Cold startup, median of 10 runs:

	Without profile	With profile
Time to initial display	1803 ms	1127 ms
Time to full display	1942 ms	1175 ms (−39.5%)

Changes

Build updates

• AGP 8.12.3 → 9.4.1, Gradle 8.13 → 9.8.1, Kotlin 2.2.21 → 2.4.21, Compose Multiplatform 1.10.0-beta01 → 1.12.2, KSP → 2.3.12, and every other library bumped to its latest stable version.
• :common and :storage now use com.android.kotlin.multiplatform.library. AGP 9 no longer allows KMP together with com.android.library.
• :android uses AGP's built-in Kotlin instead of kotlin("android").
• Room KSP moves from ksp to kspAndroid, which matches what it generated before.
• compileSdk is 37 because several libraries require it. targetSdk stays at 36.
• The iosX64 target is removed because Compose 1.12 no longer publishes it.
• kotlinx.datetime.Clock → kotlin.time.Clock, and an opt-in for DeferredTargetAnimation (now stable) is removed.
• Removed ui-test-junit4-android from the app's runtime dependencies. Nothing used it, and it was shipping in the APK.

Minification

• Release has isMinifyEnabled and isShrinkResources on, using proguard-android-optimize.txt.
• proguard-rules.pro is empty because R8 reported no missing keep rules.

Profiles

• New :baselineprofile module.
  • BaselineProfileGenerator plays a short game (draw, Auto Move, Undo, Settings drawer, New Game) and emits both a baseline profile and a startup profile. The startup profile drives dexLayoutOptimization.
  • StartupBenchmarks compares cold startup with no compilation against cold startup with the profile required.
• ReportDrawn() is added in MainActivity so time to full display is measured. The Settings and New Game icon buttons get content descriptions, which the test uses and screen readers benefit from.
• <profileable android:shell="true"> is added to the manifest.

CI

• A new baselineProfile job runs on a Gradle Managed Device (Pixel 6, API 34, AOSP image) with KVM. It uploads the generated profiles as an artifact.
• The aab and apk jobs now depend on that job and download the fresh profiles before building. The committed profiles in android/src/release/generated/baselineProfiles/ are the local fallback.

Testing

• The minified release build was installed on a device and the main flows were tested: new game, draw, Auto Move, Undo, Settings, New Game, and restoring a saved game.
• Profile generation was run locally on the managed-device emulator twice and on a physical device.
• The :desktop JVM and :common wasm targets compile.
• iosMain still fails to compile, as it did before: its dependency on storage is commented out.

Notes

• The workflow ignores .github/** and only runs on pushes to master, so this PR doesn't trigger it. Use Run workflow on this branch to try it before merging.
• Generation passes a test class filter so only the generator runs. When the skipped benchmark tests ran in the same pass, the plugin intermittently failed to find the generated profile.
• .gitignore also contains a .hotswan/ entry that was already uncommitted in the working tree.

🤖 Generated with Claude Code