fix(store): avoid mutating published injected layer lists

backend/tests/test_ai_intel_store_copy_on_write.py

@@ -0,0 +1,59 @@
+"""Regression coverage for copy-on-write OpenClaw layer injection."""
+
+from services import ai_intel_store
+from services.fetchers import _store
+
+
+def _publish_test_layer(monkeypatch, items):
+    published = list(items)
+    monkeypatch.setitem(_store.latest_data, "air_quality", published)
+    monkeypatch.setattr(_store, "bump_data_version", lambda: None)
+    return published
+
+
+def test_append_does_not_mutate_previously_published_list(monkeypatch):
+    before = _publish_test_layer(monkeypatch, [{"id": "existing"}])
+
+    result = ai_intel_store.inject_layer_data(
+        "air_quality",
+        [{"id": "injected"}],
+        mode="append",
+    )
+
+    after = _store.latest_data["air_quality"]
+    assert result == {
+        "ok": True,
+        "layer": "air_quality",
+        "injected": 1,
+        "mode": "append",
+    }
+    assert after is not before
+    assert before == [{"id": "existing"}]
+    assert [item["id"] for item in after] == ["existing", "injected"]
+    assert after[-1]["_injected"] is True
+    assert after[-1]["_source"] == "user:openclaw"
+
+
+def test_replace_does_not_mutate_previously_published_list(monkeypatch):
+    before = _publish_test_layer(
+        monkeypatch,
+        [
+            {"id": "native"},
+            {"id": "old-injected", "_injected": True},
+        ],
+    )
+
+    result = ai_intel_store.inject_layer_data(
+        "air_quality",
+        [{"id": "new-injected"}],
+        mode="replace",
+    )
+
+    after = _store.latest_data["air_quality"]
+    assert result["ok"] is True
+    assert after is not before
+    assert before == [
+        {"id": "native"},
+        {"id": "old-injected", "_injected": True},
+    ]
+    assert [item["id"] for item in after] == ["native", "new-injected"]