Later review test: its earlier summary is in the brief too

From nisse-review's draft on #156: it thought points made in a review's
summary never reached a later review. They do, as "your review: ...".

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J5Utyfzw7gF7UhjRDEtjTk

nisse-review/tests/test_review_rounds.py

@@ -120,7 +120,8 @@ def test_a_push_gets_a_later_review_of_what_changed(tmp_path: Path) -> None:
     assert w["scheduler"].round() is True
     brief = last_brief(w)
     assert "The commits since" in brief and f"diff of {PUSHED}" in brief
-    assert "split() handles tabs too." in brief  # its earlier point
+    assert "split() handles tabs too." in brief  # its earlier point on a line
+    assert "- your review: Looks right; two small points." in brief  # its summary
     review = w["gitea"].posted[-1]
     assert review["commit"] == PUSHED and marker(PUSHED, 2) in review["body"]
     known = pr_of(item(w))