Add jep511 module: module import declarations on JDK 25 and 27

Runnable sources, deliberate compile failures, three small modules and nine captured transcripts for import module (JEP 511).

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a

jep511/multi/acme.text/acme/text/Slug.java

@@ -0,0 +1,6 @@
+package acme.text;
+
+public final class Slug {
+    private Slug() {}
+    public static String of(String s) { return acme.text.internal.Helper.clean(s); }
+}

jep511/multi/acme.text/acme/text/internal/Helper.java

@@ -0,0 +1,5 @@
+package acme.text.internal;
+
+public final class Helper {
+    public static String clean(String s) { return s.toLowerCase().replaceAll("[^a-z0-9]+", "-").replaceAll("^-|-$", ""); }
+}

jep511/multi/acme.text/module-info.java

@@ -0,0 +1,3 @@
+module acme.text {
+    exports acme.text;          // acme.text.internal is NOT exported
+}

jep511/multi/demo.app/demo/App.java

@@ -0,0 +1,9 @@
+package demo;
+
+import module acme.text;     // imports Slug, but not acme.text.internal.Helper
+
+public class App {
+    public static void main(String[] args) {
+        System.out.println(Slug.of("Import Module: Hello, World!"));
+    }
+}

jep511/multi/demo.app/module-info.java

@@ -0,0 +1,3 @@
+module demo.app {
+    requires acme.text;
+}

jep511/multi/demo.bad/demo/Bad.java

@@ -0,0 +1,9 @@
+package demo;
+
+import module acme.text;
+
+public class Bad {
+    public static void main(String[] args) {
+        System.out.println(Helper.clean("x"));      // Helper is in the non-exported acme.text.internal
+    }
+}

jep511/multi/demo.bad/module-info.java

@@ -0,0 +1,3 @@
+module demo.bad {
+    requires acme.text;
+}

jep511/multi/demo.noreq/demo/NoReq.java

@@ -0,0 +1,9 @@
+package demo;
+
+import module java.sql;       // demo.noreq never says "requires java.sql"
+
+public class NoReq {
+    public static void main(String[] args) {
+        System.out.println(Connection.TRANSACTION_NONE);
+    }
+}

jep511/multi/demo.noreq/module-info.java

@@ -0,0 +1 @@
+module demo.noreq { }