fix(tests): update scheduler-status shape pins for platform_cooldowns

61ce1ce added platform_cooldowns to scheduler_status(), and two pinned
key-set assertions tied to the old shape failed in CI. Updated:

- tests/test_api_sources.py::test_schedule_status_shape — direct
  /api/sources/schedule-status response.
- tests/test_api_system_activity.py::test_summary_returns_rollup_shape
  — nested under body["scheduler"] in the summary endpoint.

[[feedback-plan-grep-pinned-tests]] miss — should have grepped tests/
for `last_tick_at` / `auto_sources` before adding the new key.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_api_sources.py

@@ -39,7 +39,10 @@ async def test_schedule_status_shape(client):
     resp = await client.get("/api/sources/schedule-status")
     assert resp.status_code == 200
     body = await resp.get_json()
-    assert set(body) == {"last_tick_at", "next_due_at", "due_now", "auto_sources"}
+    assert set(body) == {
+        "last_tick_at", "next_due_at", "due_now", "auto_sources",
+        "platform_cooldowns",
+    }
     assert isinstance(body["due_now"], int)
     assert isinstance(body["auto_sources"], int)
 

tests/test_api_system_activity.py

@@ -60,7 +60,10 @@ async def test_summary_returns_rollup_shape(client, monkeypatch):
     assert body["queued_total"] == 3  # only ml has a non-zero depth
     assert isinstance(body["running"], int)
     assert isinstance(body["failing"], int)
-    assert set(body["scheduler"]) == {"last_tick_at", "next_due_at", "due_now", "auto_sources"}
+    assert set(body["scheduler"]) == {
+        "last_tick_at", "next_due_at", "due_now", "auto_sources",
+        "platform_cooldowns",
+    }
 
 
 @pytest.mark.asyncio