Gradle build logic per Google's build docs: settings and repositories, version catalogs, convention plugins, Kotlin DSL, AGP 9 built-in Kotlin and new DSL, the Compose Compiler plugin. Use for build.gradle.kts, settings.gradle.kts, convention plugin, or libs.versions.toml changes, and for AGP 9 upgrade errors (kotlinOptions, kapt, applicationVariants) or config copied between modules.
