chore: unify checkstyle, fix violations, cleanup bin/

build.gradle.kts

@@ -1,6 +1,7 @@
 plugins {
     java
     id("com.gradleup.shadow") version "9.3.1" apply false
+    checkstyle
 }
 
 allprojects {
@@ -18,8 +19,24 @@ allprojects {
 
 subprojects {
     apply(plugin = "java")
+    apply(plugin = "checkstyle")
 
     java {
         toolchain.languageVersion.set(JavaLanguageVersion.of(21))
     }
+
+    checkstyle {
+        toolVersion = "10.21.4"
+        configFile = rootProject.file("config/checkstyle/checkstyle.xml")
+        isIgnoreFailures = false
+        maxErrors = 0
+        maxWarnings = 0
+    }
+
+    tasks.withType<Checkstyle>().configureEach {
+        reports {
+            xml.required.set(true)
+            html.required.set(true)
+        }
+    }
 }