test: remove low-value model-catalog mirror tests

These tests asserted that hardcoded curated model lists/constants still
contained specific model strings (e.g. 'glm-5' in provider_model_ids('zai'),
exact context-length values per model key, PROVIDER_TO_MODELS_DEV entries).
They mirror a constant rather than exercise logic, so they only ever break
when models are added/retired and never catch a real bug.

Removed 22 such functions across 7 files (149 deletions, 0 additions).
Behavioral siblings are kept: live-catalog-wins, fallback ordering,
substring/longest-match resolution, normalization, credential discovery,
and probe-tier stepping all still tested.

tests/hermes_cli/test_models.py

@@ -56,10 +56,6 @@ class TestOpenRouterModels:
             assert isinstance(mid, str) and len(mid) > 0
             assert isinstance(desc, str)
 
-    def test_at_least_5_models(self):
-        """Sanity check that the models list hasn't been accidentally truncated."""
-        assert len(OPENROUTER_MODELS) >= 5
-
 
 class TestFetchOpenRouterModels:
     def test_live_fetch_recomputes_free_tags(self, monkeypatch):