fix(model_switch): preserve explicit custom-provider model list when no api_key

hermes_cli/model_switch.py

@@ -1692,7 +1692,22 @@ def list_authenticated_providers(
             # Ollama servers) — the /models endpoint often works without
             # auth.  The CLI's _model_flow_named_custom always probes, so
             # the Telegram/Discord picker should do the same for parity.
-            if api_url:
+            # Live-discovery policy:
+            # - With an api_key, the user has explicitly opted into the
+            #   endpoint and live /models is the source of truth — replace
+            #   the (possibly partial) ``models:`` subset configured for
+            #   context-length overrides with the full live catalog.
+            #   This is the Bifrost / aggregator-gateway case.
+            # - Without an api_key but with an explicit ``models:`` list
+            #   (or top-level ``model:``), the user is narrowing a public
+            #   endpoint to a specific subset (e.g. ollama.com /v1/models
+            #   returns 35 models but the user only wants 4). Preserve the
+            #   explicit list and skip live discovery.
+            # - Without an api_key AND no explicit models, fall through to
+            #   live discovery so bare-endpoint custom providers (local
+            #   llama.cpp / Ollama servers) still appear populated.
+            should_probe = bool(api_url) and (bool(api_key) or not grp["models"])
+            if should_probe:
                 try:
                     from hermes_cli.models import fetch_api_models