test(cron): assert no-rotation tip resolution is a finalize no-op

With compression.in_place defaulting True the cron session id never
rotates; get_compression_tip returns the input id. Pin that the
salvaged #67188 fix titles/ends the ORIGINAL cron session in that path
(and for falsy tip returns), i.e. zero behavior change when no
compression rotation happened. Also maps colingreig's contributor
email for attribution CI.

contributors/emails/colin@colingreig.com

@@ -0,0 +1 @@
+colingreig

tests/cron/test_scheduler.py

@@ -1205,6 +1205,41 @@ class TestRunJobSessionPersistence:
             tip_session_id, "cron_complete"
         )
 
+    @pytest.mark.parametrize("tip_value", ["__same__", None, ""])
+    def test_run_job_no_rotation_finalizes_original_session_id(
+        self, tmp_path, tip_value
+    ):
+        """No-op path: with compression.in_place defaulting True, the session
+        id never rotates. get_compression_tip returns the input id (or a
+        falsy value); title + end_session must target the ORIGINAL cron id —
+        byte-for-byte the pre-fix behavior."""
+        job = {
+            "id": "no-rotation-job",
+            "name": "No rotation",
+            "prompt": "hello",
+        }
+
+        with self._run_job_patches(tmp_path) as (fake_db, mock_agent_cls):
+            if tip_value == "__same__":
+                fake_db.get_compression_tip.side_effect = (
+                    lambda session_id: session_id
+                )
+            else:
+                fake_db.get_compression_tip.return_value = tip_value
+
+            success, _output, _final_response, error = run_job(job)
+
+        assert success is True
+        assert error is None
+        original_session_id = mock_agent_cls.call_args.kwargs["session_id"]
+        fake_db.get_compression_tip.assert_called_once_with(original_session_id)
+        assert (
+            fake_db.set_session_title.call_args.args[0] == original_session_id
+        )
+        fake_db.end_session.assert_called_once_with(
+            original_session_id, "cron_complete"
+        )
+
     @pytest.mark.parametrize(
         ("agent_session_id", "expected_suffix"),
         [("agent-live-tip", "agent-live-tip"), ("", "original")],