fix(api): align kb extractor ollama model

apps/api/tests/test_knowledge_extractor_model.py

@@ -0,0 +1,16 @@
+from src.core.config import settings
+from src.services import knowledge_extractor_service
+
+
+def test_extract_model_uses_configured_ollama_tool_model(monkeypatch):
+    """KB extractor must use a configured model that exists on GCP Ollama."""
+    monkeypatch.setattr(settings, "OLLAMA_TOOL_MODEL", "hermes3:latest")
+
+    assert knowledge_extractor_service._get_extract_model() == "hermes3:latest"
+
+
+def test_extract_model_falls_back_to_hermes_when_config_empty(monkeypatch):
+    """Empty runtime config should not fall back to the removed llama3.2 model."""
+    monkeypatch.setattr(settings, "OLLAMA_TOOL_MODEL", "")
+
+    assert knowledge_extractor_service._get_extract_model() == "hermes3:latest"