test: no test throws a response away; the stream session is narrowed, not baselined

The 7 baselined Optional accesses in plex/stream.py were one fact the type did not carry: the
initial spawn (replace_only=None) always supersedes, so only the fallback respawn can get None.
An assert at the call site says so; the pyright baseline drops 195 -> 188.

test_abuse_limits: the public-URL and YouTube enqueue tests stopped at the profile lookup
(400 no_profile) and passed on that unrelated refusal. They now send an inline spec and assert
the job is queued. The same shape — a request whose response is discarded — sat at 53 more
places across the suite (all returned what they should, measured with a TestClient probe);
each now asserts its status, and test_response_checked keeps it that way (seen red).

backend/tests/test_logs.py

@@ -277,7 +277,7 @@ def test_a_signed_in_request_is_never_capped_and_names_its_account(sink):
 
     client = TestClient(app)
     for _ in range(logs.ANONYMOUS_LINES_PER_MINUTE + 3):
-        client.get("/api/me")
+        assert client.get("/api/me").status_code == 200
     records = sink.records[-(logs.ANONYMOUS_LINES_PER_MINUTE + 3) :]
     assert all(getattr(r, logs.PERSIST, True) for r in records)
     assert sink.objects()[-1]["user_id"] == 42 and "user_id" not in sink.objects()[-1]["attrs"]
@@ -325,9 +325,9 @@ def test_the_log_consoles_own_reads_are_debug_but_its_failures_are_not(sink):
     http = logging.getLogger("siftlode.http")
     http.setLevel(logs.TRACE)
     client = _client()
-    client.get("/api/admin/logs/facets")
+    assert client.get("/api/admin/logs/facets").status_code == 200
     assert sink.objects()[-1]["level"] == "DEBUG"
-    client.get("/api/admin/logs/facets?fail=1")
+    assert client.get("/api/admin/logs/facets?fail=1").status_code == 400
     assert sink.objects()[-1]["level"] == "WARNING"
 
 
@@ -344,7 +344,7 @@ def test_a_polled_read_is_debug_a_write_to_the_same_route_is_not(sink):
     r = client.post("/api/messages/unread_count")
     assert sink.objects()[-1]["level"] == "INFO"
     assert "X-Log-Quiet" not in r.headers
-    client.get("/api/videos/abc")
+    assert client.get("/api/videos/abc").status_code == 200
     assert sink.objects()[-1]["level"] == "INFO"
 
 
@@ -360,7 +360,7 @@ def test_every_polled_route_is_a_route_the_app_has():
 
 def test_a_failing_request_is_logged_by_status_and_an_unhandled_error_is_logged_at_all(sink):
     client = _client()
-    client.get("/api/videos/missing/deeper")  # 404 from the router
+    assert client.get("/api/videos/missing/deeper").status_code == 404  # 404 from the router
     assert sink.objects()[-1]["level"] == "WARNING"
     client.get("/boom")
     payload = sink.objects()[-1]