chore: remove nous-api provider (API key path)

Nous Portal only supports OAuth authentication. Remove the 'nous-api'
provider which allowed direct API key access via NOUS_API_KEY env var.

Removed from:
- hermes_cli/auth.py: PROVIDER_REGISTRY entry + aliases
- hermes_cli/config.py: OPTIONAL_ENV_VARS entry
- hermes_cli/setup.py: setup wizard option + model selection handler
  (reindexed remaining provider choices)
- agent/auxiliary_client.py: docstring references
- tests/test_runtime_provider_resolution.py: nous-api test
- tests/integration/test_web_tools.py: renamed dict key

tests/test_runtime_provider_resolution.py

@@ -158,29 +158,6 @@ def test_custom_endpoint_auto_provider_prefers_openai_key(monkeypatch):
     assert resolved["api_key"] == "sk-vllm-key"
 
 
-def test_resolve_runtime_provider_nous_api(monkeypatch):
-    """Nous Portal API key provider resolves via the api_key path."""
-    monkeypatch.setattr(rp, "resolve_provider", lambda *a, **k: "nous-api")
-    monkeypatch.setattr(
-        rp,
-        "resolve_api_key_provider_credentials",
-        lambda pid: {
-            "provider": "nous-api",
-            "api_key": "nous-test-key",
-            "base_url": "https://inference-api.nousresearch.com/v1",
-            "source": "NOUS_API_KEY",
-        },
-    )
-
-    resolved = rp.resolve_runtime_provider(requested="nous-api")
-
-    assert resolved["provider"] == "nous-api"
-    assert resolved["api_mode"] == "chat_completions"
-    assert resolved["base_url"] == "https://inference-api.nousresearch.com/v1"
-    assert resolved["api_key"] == "nous-test-key"
-    assert resolved["requested_provider"] == "nous-api"
-
-
 def test_explicit_openrouter_skips_openai_base_url(monkeypatch):
     """When the user explicitly requests openrouter, OPENAI_BASE_URL
     (which may point to a custom endpoint) must not override the