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("^-|-$", ""); }
+}