fix(awooop): cache heavy operator summaries

apps/api/tests/test_operator_summary_cache.py

@@ -0,0 +1,58 @@
+from datetime import UTC, datetime
+
+from src.services.operator_summary_cache import (
+    clear_operator_summary_cache,
+    get_cached_operator_summary,
+    store_operator_summary,
+)
+
+
+def test_operator_summary_cache_returns_copy_with_hit_metadata() -> None:
+    clear_operator_summary_cache()
+    key = {"project_id": "awoooi", "limit": 30}
+    stored = store_operator_summary(
+        "truth_chain_quality_summary",
+        key,
+        {"evaluated_total": 30, "nested": {"ok": True}},
+        ttl_seconds=30,
+        now_monotonic=100.0,
+        now_utc=datetime(2026, 6, 1, tzinfo=UTC),
+    )
+
+    assert stored["cache"]["status"] == "miss"
+    stored["nested"]["ok"] = False
+
+    cached = get_cached_operator_summary(
+        "truth_chain_quality_summary",
+        key,
+        ttl_seconds=30,
+        now_monotonic=105.5,
+    )
+
+    assert cached is not None
+    assert cached["cache"]["status"] == "hit"
+    assert cached["cache"]["age_seconds"] == 5.5
+    assert cached["nested"]["ok"] is True
+
+
+def test_operator_summary_cache_expires_by_ttl() -> None:
+    clear_operator_summary_cache()
+    key = {"project_id": "awoooi", "page": 1}
+    store_operator_summary(
+        "callback_replies",
+        key,
+        {"total": 4},
+        ttl_seconds=20,
+        now_monotonic=200.0,
+        now_utc=datetime(2026, 6, 1, tzinfo=UTC),
+    )
+
+    assert (
+        get_cached_operator_summary(
+            "callback_replies",
+            key,
+            ttl_seconds=20,
+            now_monotonic=220.0,
+        )
+        is None
+    )