build: drop the foojay toolchain resolver (reproducible-build safe)

The Gradle Java-toolchain auto-download resolver can fetch a JDK at build time,
which an offline / reproducible F-Droid build scanner rejects. It was unused —
modules set jvmTarget directly with no toolchain block — so removing it is a
no-op for the build and brings Agendula in line with floret-kit's no-resolver
rule. Clean assembleDebug verified.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

settings.gradle.kts

@@ -11,9 +11,10 @@ pluginManagement {
         gradlePluginPortal()
     }
 }
-plugins {
-    id("org.gradle.toolchains.foojay-resolver-convention") version "1.0.0"
-}
+
+// No Gradle Java-toolchain auto-download resolver plugin: it can fetch a JDK at
+// build time, which an offline / reproducible F-Droid build scanner rejects.
+// Modules set jvmTarget directly, so no toolchain resolver is needed.
 
 dependencyResolutionManagement {
     repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)