test: registry cost-guard passthrough uses a models.dev-trusted provider

The custom-provider pricing-trust fix makes provider="test" (not a
models.dev provider) correctly silent — use anthropic in the fixture.

tests/hermes_cli/test_model_selection_guards.py

@@ -93,11 +93,11 @@ def test_cost_guard_still_fires_through_registry():
         id="pricey/model",
         name="pricey/model",
         family="",
-        provider_id="test",
+        provider_id="anthropic",
         cost_input=50.0,
         cost_output=200.0,
     )
     warnings = selection_warnings(
-        "pricey/model", provider="test", model_info=info
+        "pricey/model", provider="anthropic", model_info=info
     )
     assert any(w.kind == "cost" for w in warnings)