test(config): clear agent env for defaults

Author: Sakeeb91

tests/unit/test_config.py

@@ -56,8 +56,12 @@ def test_invalid_url_raises_error(self, monkeypatch: pytest.MonkeyPatch) -> None
 class TestAgentSettings:
     """Tests for AgentSettings."""
 
-    def test_default_values(self) -> None:
+    def test_default_values(self, monkeypatch: pytest.MonkeyPatch) -> None:
         """Test default agent settings."""
+        monkeypatch.delenv("AGENT_MODEL_BACKEND", raising=False)
+        monkeypatch.delenv("AGENT_USE_LEGACY_FALLBACK", raising=False)
+        monkeypatch.delenv("AGENT_INFERENCE_PROVIDER", raising=False)
+        monkeypatch.delenv("AGENT_INFERENCE_TIMEOUT", raising=False)
         settings = AgentSettings()
         assert settings.enabled is True
         assert settings.use_legacy_fallback is True