Merge remote-tracking branch 'gh/main' into wire2/2wu3

web/app.js

@@ -181,7 +181,8 @@ function workerTransport() {
     shell.fail(`worker failed to start: ${event.message ?? "see console"}`);
     console.error("improvise: worker error", event);
   });
-  shell.setShell(`in-page worker · ${DOC}`);
+  // Not yet a claim that it works: the first frame makes that (improvise-i0v9).
+  shell.setShell(`starting the worker · ${DOC}…`);
   // Frames posted before the worker has finished `start()` are held by
   // worker.js in arrival order, so the handshake can go out immediately.
   return { send: (text) => worker.postMessage(text), ready: Promise.resolve() };
@@ -801,6 +802,7 @@ shell.arm(
   WS_URL
     ? `${WS_URL} never answered — is improvise-ws-server running, and did it send a document?`
     : "the in-page worker did not answer (see console)",
+  { answer: WS_URL ? null : `in-page worker · ${DOC}` },
 );
 await transport.ready;
 sendViewport(); // the handshake: the snapshot is built at this extent