chore: harden Gradle dependency reproducibility

feat: enable Gradle dependency locking for all configurations
feat: enforce strict lock-state usage in the build
feat: centralize repository declaration in settings.gradle
feat: enable strict Gradle dependency verification via gradle.properties
feat: add committed dependency lock state and verification metadata
fix: defer mockito agent resolution to test execution phase for locked builds
ci: validate reproducibility inputs before workflow builds
ci: include lock and verification inputs in workflow change detection
docs: establish explicit dependency update workflow for locks and verification metadata

settings.gradle

@@ -1 +1,8 @@
 rootProject.name = 'Radixor'
+
+dependencyResolutionManagement {
+    repositoriesMode = RepositoriesMode.FAIL_ON_PROJECT_REPOS
+    repositories {
+        mavenCentral()
+    }
+}