fix: prevent model/provider mismatch when switching providers during active gateway (#1183)

When _update_config_for_provider() writes the new provider and base_url
to config.yaml, the gateway (which re-reads config per-message) can pick
up the change before model selection completes. This causes the old model
name (e.g. 'anthropic/claude-opus-4.6') to be sent to the new provider's
API (e.g. MiniMax), which fails.

Changes:
- _update_config_for_provider() now accepts an optional default_model
  parameter. When provided and the current model.default is empty or
  uses OpenRouter format (contains '/'), it sets a safe default model
  for the new provider.
- All setup.py callers for direct-API providers (zai, kimi, minimax,
  minimax-cn, anthropic) now pass a provider-appropriate default model.
- _setup_provider_model_selection() now validates the 'Keep current'
  choice: if the current model uses OpenRouter format and wouldn't work
  with the new provider, it warns and switches to the provider's first
  default model instead of silently keeping the incompatible name.

Reported by a user on Home Assistant whose gateway started sending
'anthropic/claude-opus-4.6' to MiniMax's API after running hermes setup.

hermes_cli/setup.py

@@ -111,7 +111,17 @@ def _setup_provider_model_selection(config, provider_id, current_model, prompt_c
         custom = prompt_fn("Enter model name")
         if custom:
             _set_default_model(config, custom)
-    # else: keep current
+    else:
+        # "Keep current" selected — validate it's compatible with the new
+        # provider.  OpenRouter-formatted names (containing "/") won't work
+        # on direct-API providers and would silently break the gateway.
+        if "/" in (current_model or "") and provider_models:
+            print_warning(
+                f"Current model \"{current_model}\" looks like an OpenRouter model "
+                f"and won't work with {pconfig.name}. "
+                f"Switching to {provider_models[0]}."
+            )
+            _set_default_model(config, provider_models[0])
 
 
 def _sync_model_from_disk(config: Dict[str, Any]) -> None:
@@ -967,7 +977,7 @@ def setup_model_provider(config: dict):
         if existing_custom:
             save_env_value("OPENAI_BASE_URL", "")
             save_env_value("OPENAI_API_KEY", "")
-        _update_config_for_provider("zai", zai_base_url)
+        _update_config_for_provider("zai", zai_base_url, default_model="glm-5")
         _set_model_provider(config, "zai", zai_base_url)
 
     elif provider_idx == 5:  # Kimi / Moonshot
@@ -1000,7 +1010,7 @@ def setup_model_provider(config: dict):
         if existing_custom:
             save_env_value("OPENAI_BASE_URL", "")
             save_env_value("OPENAI_API_KEY", "")
-        _update_config_for_provider("kimi-coding", pconfig.inference_base_url)
+        _update_config_for_provider("kimi-coding", pconfig.inference_base_url, default_model="kimi-k2.5")
         _set_model_provider(config, "kimi-coding", pconfig.inference_base_url)
 
     elif provider_idx == 6:  # MiniMax
@@ -1033,7 +1043,7 @@ def setup_model_provider(config: dict):
         if existing_custom:
             save_env_value("OPENAI_BASE_URL", "")
             save_env_value("OPENAI_API_KEY", "")
-        _update_config_for_provider("minimax", pconfig.inference_base_url)
+        _update_config_for_provider("minimax", pconfig.inference_base_url, default_model="MiniMax-M2.5")
         _set_model_provider(config, "minimax", pconfig.inference_base_url)
 
     elif provider_idx == 7:  # MiniMax China
@@ -1066,7 +1076,7 @@ def setup_model_provider(config: dict):
         if existing_custom:
             save_env_value("OPENAI_BASE_URL", "")
             save_env_value("OPENAI_API_KEY", "")
-        _update_config_for_provider("minimax-cn", pconfig.inference_base_url)
+        _update_config_for_provider("minimax-cn", pconfig.inference_base_url, default_model="MiniMax-M2.5")
         _set_model_provider(config, "minimax-cn", pconfig.inference_base_url)
 
     elif provider_idx == 8:  # Anthropic
@@ -1170,7 +1180,7 @@ def setup_model_provider(config: dict):
             save_env_value("OPENAI_API_KEY", "")
         # Don't save base_url for Anthropic — resolve_runtime_provider()
         # always hardcodes it. Stale base_urls contaminate other providers.
-        _update_config_for_provider("anthropic", "")
+        _update_config_for_provider("anthropic", "", default_model="claude-opus-4-6")
         _set_model_provider(config, "anthropic")
 
     # else: provider_idx == 9 (Keep current) — only shown when a provider already exists