fix(store): preserve non-mapping native layer entries (#508)

* fix(store): preserve non-mapping native layer entries

* test(store): cover mixed native injection cleanup

backend/tests/test_ai_intel_store_mixed_items.py

@@ -0,0 +1,46 @@
+"""Regression coverage for mixed native entries during injected-data cleanup."""
+
+from services import ai_intel_store
+from services.fetchers import _store
+
+
+def _publish_mixed_layer(monkeypatch):
+    published = [
+        "native-sentinel",
+        {"id": "native"},
+        {"id": "old-injected", "_injected": True},
+    ]
+    monkeypatch.setitem(_store.latest_data, "air_quality", published)
+    monkeypatch.setattr(_store, "bump_data_version", lambda: None)
+    return published
+
+
+def test_replace_preserves_non_mapping_native_entries(monkeypatch):
+    before = _publish_mixed_layer(monkeypatch)
+
+    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 after[0] == "native-sentinel"
+    assert [item.get("id") for item in after if isinstance(item, dict)] == [
+        "native",
+        "new-injected",
+    ]
+
+
+def test_clear_preserves_non_mapping_native_entries(monkeypatch):
+    _publish_mixed_layer(monkeypatch)
+
+    result = ai_intel_store.clear_injected_data("air_quality")
+
+    assert result == {"ok": True, "removed": 1}
+    assert _store.latest_data["air_quality"] == [
+        "native-sentinel",
+        {"id": "native"},
+    ]