test(harbor): use caplog.messages instead of LogRecord.message

Greptile on #20: .message is only set by Formatter.format(), which
pytest's capture handler never calls; caplog.messages goes through
getMessage() and is stable across pytest versions.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: shehabyasser-scale

vero/tests/test_harbor_serve.py

@@ -233,7 +233,9 @@ def test_mode_b_sample_timeout_warns(caplog):
     )
     with caplog.at_level("WARNING"):
         _warn_mode_b_sample_timeout(ServeConfig(**base, sample_timeout=1200))
-    assert any("not enforced in Mode B" in r.message for r in caplog.records)
+    # caplog.messages (getMessage()) rather than r.message: pytest's capture
+    # handler does not run Formatter.format(), so .message may be unset.
+    assert any("not enforced in Mode B" in m for m in caplog.messages)
 
     caplog.clear()
     with caplog.at_level("WARNING"):