Fixed Maven publishing

- ItemsAdder API resolves from Maven Central
- Integration repositories only resolve their assigned groups and modules
- Shared VolmLib classes and packaging use the same pinned revision
- JitPack builds and publishes with remote dependencies
- Local Maven publication uses art.arcane:iris with the configured version
- API generation tracks the final archive filename lazily
- API jars retain signatures and metadata with valid throwing method stubs
- Publication tests verify metadata, bytecode, and consumer compilation

buildSrc/build.gradle

@@ -24,6 +24,10 @@ tasks.named('jar').configure {
     dependsOn(tasks.named('test'))
 }
 
+tasks.named('test').configure {
+    jvmArgs('--add-opens=java.base/java.lang=ALL-UNNAMED')
+}
+
 dependencies {
     implementation(gradleApi())
     implementation('org.ow2.asm:asm:9.10.1')