docs(comments): no WebSocket and no CI in the present tense

The chat cut removed the only WebSocket and CI went before it, but comments still leaned on both:
`?account=` was justified by the socket, job polling by an in-process WS registry, the e2e flows as
"proxy-safe (none use the WebSocket)", and pyrightconfig named a CI container the engine contract
test never checked. Each now says what holds today (the wallet gate, no push channel, the two
contract test halves, the image build's `npm ci`, the gate).

frontend/src/components/ui/ItemCount.dom.test.tsx

@@ -29,7 +29,7 @@ describe("ItemCount", () => {
   it("pluralises and thousands-separates a normal count", () => {
     render(<ItemCount count={192045} />);
     // Separators come from the shared formatNumber — compare against it, not a fixed en-US string,
-    // so the test asserts ItemCount's formatting path rather than the CI locale.
+    // so the test asserts ItemCount's formatting path rather than the runner's locale.
     expect(text()).toBe(`${formatNumber(192045, "en")} items`);
   });