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).

backend/tests/test_plex_stream.py

@@ -331,7 +331,7 @@ class TestWantHw:
 
     @staticmethod
     def _opencl(monkeypatch, present):
-        # Pin the OpenCL-runtime probe so the routing doesn't depend on the CI box's /etc/OpenCL.
+        # Pin the OpenCL-runtime probe so the routing doesn't depend on the test machine's /etc/OpenCL.
         monkeypatch.setattr(stream, "_opencl_present", lambda: present)
 
     def test_no_hw_when_not_transcoding(self, monkeypatch):