chore: publish from staged

extensions/release-notes-showcase/extension.mjs

@@ -0,0 +1,7 @@
+import { joinSession } from "@github/copilot-sdk/extension";
+
+import { releaseNotesShowcaseCanvas } from "./releaseNotesShowcase.mjs";
+
+await joinSession({
+    canvases: [releaseNotesShowcaseCanvas],
+});