AGP 9 enables built-in Kotlin by default (`android.builtInKotlin=true`),
which we initially adopted by dropping the `kotlin-android` plugin
alias. But KSP isn't compatible with built-in Kotlin yet — Gradle
errors out with:
> KSP is not compatible with Android Gradle Plugin's built-in Kotlin.
> Please disable by adding android.builtInKotlin=false to gradle.properties
> and apply kotlin("android") plugin
Restored the explicit kotlin-android plugin (root + :app) and added
`android.builtInKotlin=false` to gradle.properties. Revisit when KSP
gains built-in-Kotlin support.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
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