chore: upgrade to agp 9.0

gradle.properties

@@ -8,8 +8,17 @@ android.useAndroidX=true
 # Compose Screenshot Testing (experimental)
 android.experimental.enableScreenshotTest=true
 
-# Enable optimized resource shrinking, only needed before AGP 9.0.0.
-android.r8.optimizedResourceShrinking=true
+# TODO: AGP 9 migration — remove these flags once dependent plugins support AGP 9's new defaults.
+#  builtInKotlin: AGP 9 absorbs Kotlin compilation. To remove:
+#    - Remove `kotlin.android` plugin from aether/, sample/, and root build.gradle.kts
+#    - Move `kotlin { explicitApi() }` to android { kotlin { ... } } or tasks.withType<KotlinCompile>
+#    - Update detekt hook in root build.gradle.kts (triggers on `plugins.withId("org.jetbrains.kotlin.android")`)
+#    - See https://issuetracker.google.com/438678642
+#  newDsl: Detekt 1.23.x casts to BaseExtension which AGP 9 removed. To remove:
+#    - Upgrade detekt to 2.x (has AGP 9 support)
+#    - Also check maps-secrets plugin compatibility
+android.builtInKotlin=false
+android.newDsl=false
 
 # mavenPublish plugin configuration
 SONATYPE_HOST=CENTRAL_PORTAL

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 # Plugins
-agp = "8.13.2"
+agp = "9.0.0"
 bcv = "0.18.1"
 maven-publish = "0.36.0"
 screenshot = "0.0.1-alpha13"

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME