feat(java): Phase 1.5 — tree-sitter Java frontend, package-aware mv, e2e fixtures

tests/java/README.md

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-> Planned Phase 1.5 fixture tree. `jmove` does not support Java yet; this folder intentionally holds only this note so nothing is dead code. See `docs/PLAN.md`.

tests/java/basic/src/main/java/Main.java

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+// No package declaration: the default package, un-importable.
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("hi");
+    }
+}

tests/java/basic/src/main/java/com/example/app/App.java

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+package com.example.app;
+
+import com.example.util.Text;
+import static com.example.util.Text.shout;
+import com.example.unknown.*;
+import java.util.List;
+
+public class App {
+    private final List<String> items = List.of(shout("hi"), new Text().render());
+}

tests/java/basic/src/main/java/com/example/model/User.java

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+package com.example.model;
+
+import com.example.util.Text;
+
+public class User {
+    String loudName() {
+        return Text.shout("user");
+    }
+}

tests/java/basic/src/main/java/com/example/util/Text.java

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+package com.example.util;
+
+public class Text {
+    public static String shout(String s) {
+        return s.toUpperCase();
+    }
+
+    public String render() {
+        return "text";
+    }
+}