works now

stub/build.gradle.kts

@@ -0,0 +1,24 @@
+plugins {
+    alias(libs.plugins.android.library)
+}
+
+android {
+    namespace = "io.github.a13e300.stub"
+    defaultConfig {
+        consumerProguardFiles("consumer-rules.pro")
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+}
+
+dependencies {
+    compileOnly(libs.annotation)
+}