fix: publish schedules after creation watermark

tests/wf_api/test_schedules.py

@@ -528,6 +528,26 @@ async def test_create_initializes_consumed_no_backfill(tmp_path: Path) -> None:
     assert consumed is not None and consumed >= created_at
 
 
+async def test_create_watermark_failure_does_not_publish_schedule(
+    tmp_path: Path,
+) -> None:
+    """A failed creation watermark cannot expose a backfillable schedule."""
+    api, sched_store, _ = _fault_harness(tmp_path / "torn_create")
+    sched_store.armed = True
+
+    with pytest.raises(OSError, match="injected consumed failure"):
+        await api.create_schedule(
+            schedule_id="s",
+            deployment_id="dep.personal",
+            trigger=_cron(),
+            misfire="latest",
+        )
+
+    with pytest.raises(KeyError):
+        sched_store.get_schedule("s")
+    assert sched_store.get_consumed("s") is None
+
+
 async def test_update_watermark_failure_leaves_revision(tmp_path: Path) -> None:
     api, sched_store, _ = _fault_harness(tmp_path / "torn_update")