test: make local llama.cpp the default runtime (#77)

tests/test_local_runtime_defaults.py

@@ -0,0 +1,21 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+import yaml
+
+
+def test_config_defaults_to_local_llama_cpp_runtime() -> None:
+    config = yaml.safe_load(Path("config.yaml").read_text())
+
+    assert config["model"]["provider"] == "custom"
+    assert config["model"]["default"] == "hermes4:14b"
+    assert config["model"]["base_url"] == "http://localhost:8081/v1"
+
+    local_provider = next(
+        entry for entry in config["custom_providers"] if entry["name"] == "Local llama.cpp"
+    )
+    assert local_provider["model"] == "hermes4:14b"
+
+    assert config["fallback_model"]["provider"] == "custom"
+    assert config["fallback_model"]["model"] == "gemini-2.5-pro"