remove Vercel AI Gateway and Vercel Sandbox (#33067)

* remove Vercel AI Gateway provider and Vercel Sandbox terminal backend

Both Vercel-hosted integrations are removed end-to-end. Users on the AI
Gateway should switch to OpenRouter or one of the other aggregators
(Nous Portal, Kilo Code). Users on the Vercel Sandbox backend should
switch to Docker, Modal, Daytona, or SSH.

What's removed:
- `plugins/model-providers/ai-gateway/` provider plugin
- `hermes_cli/vercel_auth.py` Vercel-Sandbox auth helper
- `tools/environments/vercel_sandbox.py` terminal backend
- `ai-gateway` provider wiring across auth, doctor, setup, models,
  config, status, providers, main, web_server, model_normalize, dump
- `vercel_sandbox` backend wiring across terminal_tool, file_tools,
  code_execution_tool, file_operations, approval, skills_tool,
  environments/local, credential_files, lazy_deps, prompt_builder,
  cli, gateway/run
- `AI_GATEWAY_BASE_URL` constant, `_AI_GATEWAY_HEADERS` auxiliary-client
  header set, run_agent base-URL header/reasoning special-cases
- `[vercel]` pyproject extra and `vercel`/`vercel-workers` from uv.lock
- env vars: `AI_GATEWAY_API_KEY`, `AI_GATEWAY_BASE_URL`, `VERCEL_TOKEN`,
  `VERCEL_PROJECT_ID`, `VERCEL_TEAM_ID`, `VERCEL_OIDC_TOKEN`,
  `TERMINAL_VERCEL_RUNTIME`
- Tests: deletes test_ai_gateway_models.py and
  test_vercel_sandbox_environment.py; scrubs references across 23
  surviving test files (no entire tests deleted unless they were
  dedicated to AI Gateway / Sandbox)
- Docs: provider tables, env-var reference, setup guides, security
  notes, tool config, terminal-backend tables — English plus zh-Hans
  i18n parity
- `hermes-agent` skill: provider table entry and remote-backend list

What stays (intentional):
- `popular-web-designs/templates/vercel.md` — CSS design reference,
  unrelated to Vercel-the-AI-product
- `x-vercel-id` in `stream_diag.py` headers — generic Vercel CDN
  response header, useful diag signal on any Vercel-hosted endpoint
- `vercel-labs/agent-browser` URL in browser config — lightpanda
  browser project, different OSS effort
- `userStories.json` historical contributor entry mentioning Vercel
  Sandbox — archive, not active docs

Validation:
- 1153 tests in the 22 targeted files pass (`scripts/run_tests.sh`)
- Full repo `py_compile` clean
- Live import of every touched module + invariant check (no
  `ai-gateway` in `PROVIDER_REGISTRY`, no `_AI_GATEWAY_HEADERS`, no
  `vercel_sandbox` in `_REMOTE_TERMINAL_BACKENDS`)

* test: convert profile-count check from change-detector to invariant

The hardcoded "== 34" assertion broke when ai-gateway was removed.
Per AGENTS.md change-detector-test guidance, assert the relationship
(registry count >= number of plugin dirs) instead of a literal count.
Counts shift when providers are added/removed; that's expected.

tests/run_agent/test_provider_attribution_headers.py

@@ -1,8 +1,4 @@
-"""Attribution default_headers applied per provider via base-URL detection.
-
-Mirrors the OpenRouter pattern for the Vercel AI Gateway so that
-referrerUrl / appName / User-Agent flow into gateway analytics.
-"""
+"""Attribution default_headers applied per provider via base-URL detection."""
 from types import SimpleNamespace
 from unittest.mock import MagicMock, patch
 
@@ -28,26 +24,6 @@ def test_openrouter_base_url_applies_or_headers(mock_openai):
     assert headers["X-Title"] == "Hermes Agent"
 
 
-@patch("run_agent.OpenAI")
-def test_ai_gateway_base_url_applies_attribution_headers(mock_openai):
-    mock_openai.return_value = MagicMock()
-    agent = AIAgent(
-        api_key="test-key",
-        base_url="https://openrouter.ai/api/v1",
-        model="test/model",
-        quiet_mode=True,
-        skip_context_files=True,
-        skip_memory=True,
-    )
-
-    agent._apply_client_headers_for_base_url("https://ai-gateway.vercel.sh/v1")
-
-    headers = agent._client_kwargs["default_headers"]
-    assert headers["HTTP-Referer"] == "https://hermes-agent.nousresearch.com"
-    assert headers["X-Title"] == "Hermes Agent"
-    assert headers["User-Agent"].startswith("HermesAgent/")
-
-
 @patch("run_agent.OpenAI")
 def test_routermint_base_url_applies_user_agent_header(mock_openai):
     mock_openai.return_value = MagicMock()

tests/run_agent/test_provider_parity.py

@@ -313,40 +313,6 @@ class TestBuildApiKwargsKimiNoTemperatureOverride:
         assert "temperature" not in kwargs
 
 
-class TestBuildApiKwargsAIGateway:
-    def test_uses_chat_completions_format(self, monkeypatch):
-        agent = _make_agent(monkeypatch, "ai-gateway", base_url="https://ai-gateway.vercel.sh/v1", model="gpt-4o")
-        messages = [{"role": "user", "content": "hi"}]
-        kwargs = agent._build_api_kwargs(messages)
-        assert "messages" in kwargs
-        assert "model" in kwargs
-        assert kwargs["messages"][-1]["content"] == "hi"
-
-    def test_no_responses_api_fields(self, monkeypatch):
-        agent = _make_agent(monkeypatch, "ai-gateway", base_url="https://ai-gateway.vercel.sh/v1", model="gpt-4o")
-        messages = [{"role": "user", "content": "hi"}]
-        kwargs = agent._build_api_kwargs(messages)
-        assert "input" not in kwargs
-        assert "instructions" not in kwargs
-        assert "store" not in kwargs
-
-    def test_includes_reasoning_in_extra_body(self, monkeypatch):
-        agent = _make_agent(monkeypatch, "ai-gateway", base_url="https://ai-gateway.vercel.sh/v1", model="gpt-4o")
-        messages = [{"role": "user", "content": "hi"}]
-        kwargs = agent._build_api_kwargs(messages)
-        extra = kwargs.get("extra_body", {})
-        assert "reasoning" in extra
-        assert extra["reasoning"]["enabled"] is True
-
-    def test_includes_tools(self, monkeypatch):
-        agent = _make_agent(monkeypatch, "ai-gateway", base_url="https://ai-gateway.vercel.sh/v1", model="gpt-4o")
-        messages = [{"role": "user", "content": "hi"}]
-        kwargs = agent._build_api_kwargs(messages)
-        assert "tools" in kwargs
-        tool_names = [t["function"]["name"] for t in kwargs["tools"]]
-        assert "web_search" in tool_names
-
-
 class TestBuildApiKwargsNousPortal:
     def test_includes_nous_product_tags(self, monkeypatch):
         from agent.portal_tags import nous_portal_tags