fix: resolve post-merge issues in auxiliary_client and model flow

- Add missing `from agent.credential_pool import load_pool` import to
  auxiliary_client.py (introduced by the credential pool feature in main)
- Thread `args` through `select_provider_and_model(args=None)` so TLS
  options from `cmd_model` reach `_model_flow_nous`
- Mock `_require_tty` in test_cmd_model_forwards_nous_login_tls_options
  so it can run in non-interactive test environments

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_cli_provider_resolution.py

@@ -560,6 +560,7 @@ def test_model_flow_custom_saves_verified_v1_base_url(monkeypatch, capsys):
 
 
 def test_cmd_model_forwards_nous_login_tls_options(monkeypatch):
+    monkeypatch.setattr(hermes_main, "_require_tty", lambda *a: None)
     monkeypatch.setattr(
         "hermes_cli.config.load_config",
         lambda: {"model": {"default": "gpt-5", "provider": "nous"}},