hermes auth add google-gemini-cli called pool.add_entry() but never wrote
to providers["google-gemini-cli"] or set active_provider in auth.json.
_model_section_has_credentials() checks get_active_provider() first; with
active_provider unset and no api_key_env_vars configured for oauth_external
providers, the setup wizard reported "No inference provider configured" even
after a successful OAuth login.
Add _mark_google_gemini_cli_active() in auth.py: writes a minimal provider
state entry (email for display only) and calls _save_provider_state() to set
active_provider. The function deliberately does not copy access_token or
refresh_token — those are managed by agent.google_oauth in the Google
credential file and must not be duplicated in auth.json where they would
become stale.
pool.add_entry() is retained so "hermes auth list" continues to show the entry.
Runtime credential resolution continues to use agent.google_oauth directly.
Mirrors the fix applied to openai-codex (#37517) and xai-oauth (#37576).
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