fix(auth): stop silently falling back to OpenRouter when no provider is configured (#3862)

Previously, when no API keys or provider credentials were found, Hermes
silently defaulted to OpenRouter + Claude Opus. This caused confusion
when users configured local servers (LM Studio, Ollama, etc.) with a
typo or unrecognized provider name — the system would silently route to
OpenRouter instead of telling them something was wrong.

Changes:
- resolve_provider() now raises AuthError when no credentials are found
  instead of returning 'openrouter' as a silent fallback
- Added local server aliases: lmstudio, ollama, vllm, llamacpp → custom
- Removed hardcoded 'anthropic/claude-opus-4.6' fallback from gateway
  and cron scheduler (they read from config.yaml instead)
- Updated cli-config.yaml.example with complete provider documentation
  including all supported providers, aliases, and local server setup

hermes_cli/auth.py

@@ -696,6 +696,10 @@ def resolve_provider(
         "hf": "huggingface", "hugging-face": "huggingface", "huggingface-hub": "huggingface",
         "go": "opencode-go", "opencode-go-sub": "opencode-go",
         "kilo": "kilocode", "kilo-code": "kilocode", "kilo-gateway": "kilocode",
+        # Local server aliases — route through the generic custom provider
+        "lmstudio": "custom", "lm-studio": "custom", "lm_studio": "custom",
+        "ollama": "custom", "vllm": "custom", "llamacpp": "custom",
+        "llama.cpp": "custom", "llama-cpp": "custom",
     }
     normalized = _PROVIDER_ALIASES.get(normalized, normalized)
 
@@ -742,7 +746,12 @@ def resolve_provider(
             if has_usable_secret(os.getenv(env_var, "")):
                 return pid
 
-    return "openrouter"
+    raise AuthError(
+        "No inference provider configured. Run 'hermes model' to choose a "
+        "provider and model, or set an API key (OPENROUTER_API_KEY, "
+        "OPENAI_API_KEY, etc.) in ~/.hermes/.env.",
+        code="no_provider_configured",
+    )
 
 
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