resolve_provider() auto-detection only checked OPENROUTER_API_KEY/
OPENAI_API_KEY env vars, never the credential pool. A key added via
`hermes auth add openrouter` (manual pool entry, no env var) was invisible:
the provider failed to resolve or resolved with an empty api_key, so
requests went out with no Authorization header and OpenRouter returned
"HTTP 401: Missing Authentication header" while `hermes auth list` showed
the credential. Closes#42130.
- auth.py: check load_pool("openrouter").has_credentials() after the env check
- dump.py: `debug share` shows 'openrouter set (auth pool)' instead of the
misleading 'not set' when the key lives in the pool
- add regression tests (pool credential auto-detects; empty pool still raises)
