fix(worker): name the published script version in the browser check (#72)

The dashboard editor shows a saved draft while requests are served by the
last deployed version. A user with the new text in the editor was running
the pre-beta.15 script, which writes Blob frames into the socket on current
compatibility dates (Cloudflare warns "This TransformStream is being used as
a byte stream ...") and drops every tunnel (#53). Reproduced on local
workerd: the old script logs exactly that warning, the current one does not.

GET /apiws now answers "TGLock Worker <version>" and X-TGLock-Worker, and the
docs say a missing line means an old script is still deployed.

Co-authored-by: babin <Thartewerner536e@engineer.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

worker/tglock-worker.test.js

@@ -77,7 +77,11 @@ async function fixture({ opened = Promise.resolve(), write, timeout = false } =
 
 test("HTTP deployment check does not claim Telegram connectivity", async () => {
   const f = await fixture();
-  assert.equal((await f.fetch("/apiws", { Upgrade: "" })).status, 426);
+  const check = await f.fetch("/apiws", { Upgrade: "" });
+  assert.equal(check.status, 426);
+  // The browser check names the published version (#53).
+  assert.match(check.body, /^expected a websocket upgrade\nTGLock Worker \d{4}-\d{2}-\d{2}\n$/);
+  assert.match(check.headers["X-TGLock-Worker"], /^\d{4}-\d{2}-\d{2}$/);
   assert.equal(f.state.connects, 0);
 });