Full audit fixpass: 93 defect fixes, 14 perf wins, vestigial cleanup

adapters/bukkit/plugin/build.gradle

@@ -14,6 +14,9 @@ dependencies {
         transitive = false
     }
     compileOnly(libs.paper.api)
+    // LogFilterSVC (constructed in Iris.enable's explicit service list) implements the
+    // log4j-core Filter interface, so its constructor reference needs the type resolvable.
+    compileOnly(libs.log4j.core)
     testImplementation('junit:junit:4.13.2')
     testImplementation('org.mockito:mockito-core:5.23.0')
     testImplementation(libs.paper.api)