feat(check): java public-class ⇄ file-name mismatch — layout finding with a ready jmove mv repair

- parser::java::class_name: exactly-one-public-top-level-type rule
  (package-info/module-info and 0-or-2-public files skipped)
- check gains name_mismatches[] (JSON, omitted when clean) + human lines;
  exit 2 covers both kinds; fix engine untouched by design — a file rename
  is not a byte edit, and mv keeps the FQN so no imports change
- output split into output/{mod,check} to stay under the 250-line rule
- e2e: reports Bad.java, stays quiet on Good.java, suggested rename makes
  check pass and preserves the file bytes

tests/cli_name_check.rs

@@ -0,0 +1,43 @@
+//! `jmove check` finds Java files whose public type is misnamed, and the
+//! suggested `jmove mv` repairs the layout.
+
+mod common;
+
+use common::{copy_fixture, in_root, jmove, read};
+use predicates::prelude::*;
+
+const BAD: &str = "src/main/java/com/example/Bad.java";
+
+#[test]
+fn check_reports_misnamed_public_class_and_clean_files_stay_quiet() {
+    let tmp = copy_fixture("java", "mismatch");
+    jmove(&tmp, &["check"])
+        .code(2)
+        .stdout(
+            predicate::str::contains(
+                "src/main/java/com/example/Bad.java:3: public class 'Wrong' must live in 'src/main/java/com/example/Wrong.java'",
+            )
+            .and(predicate::str::contains("Good.java").not()),
+        );
+    jmove(&tmp, &["check", "--json"])
+        .code(2)
+        .stdout(
+            predicate::str::contains("\"name_mismatches\"")
+                .and(predicate::str::contains("\"public_class\": \"Wrong\""))
+                .and(predicate::str::contains(
+                    "\"rename\": \"jmove mv 'src/main/java/com/example/Bad.java' 'src/main/java/com/example/Wrong.java'\"",
+                )),
+        );
+}
+
+#[test]
+fn running_the_suggested_rename_makes_check_pass() {
+    let tmp = copy_fixture("java", "mismatch");
+    jmove(&tmp, &["mv", BAD, "src/main/java/com/example/Wrong.java"]).success();
+    let moved = read(&in_root(tmp.path(), "src/main/java/com/example/Wrong.java"));
+    assert!(moved.contains("public class Wrong {}"), "{moved}");
+    assert!(moved.contains("package com.example;"), "{moved}");
+    jmove(&tmp, &["check"])
+        .success()
+        .stdout(predicate::str::contains("no findings"));
+}