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_set_password_link.py

@@ -68,8 +68,12 @@ def test_using_the_link_evicts_whoever_held_the_old_password(db, as_user, make_u
     admin = make_user(role="admin")
     db.commit()
     token = _link(as_user(admin), target.id)
-    client.post(
-        "/auth/password-reset/confirm", json={"token": token, "password": "the owner's own choice"}
+    assert (
+        client.post(
+            "/auth/password-reset/confirm",
+            json={"token": token, "password": "the owner's own choice"},
+        ).status_code
+        == 200
     )
 
     db.refresh(target)