Add SIN.04028 tutorial material, tutor prompt and conversation log

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

SIN.04028-From-Calling-to-Eventing/supplemental-java/03-static-filesystem/SensorService.java

@@ -0,0 +1,13 @@
+void main() throws Exception {
+    while (true) {
+        var text = IO.readln();
+
+        if (text == null)
+            return;
+
+        FileMessageBoard.publish(
+            "consoleIn/outbox",
+            new Message("TEXT", text)
+        );
+    }
+}