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.

skills/autonomous-ai-agents/hermes-agent/SKILL.md

@@ -389,7 +389,6 @@ Full config reference: https://hermes-agent.nousresearch.com/docs/user-guide/con
 | Alibaba / DashScope | API key | `DASHSCOPE_API_KEY` |
 | Xiaomi MiMo | API key | `XIAOMI_API_KEY` |
 | Kilo Code | API key | `KILOCODE_API_KEY` |
-| AI Gateway (Vercel) | API key | `AI_GATEWAY_API_KEY` |
 | OpenCode Zen | API key | `OPENCODE_ZEN_API_KEY` |
 | OpenCode Go | API key | `OPENCODE_GO_API_KEY` |
 | Qwen OAuth | OAuth | `hermes auth add qwen-oauth` |
@@ -995,7 +994,7 @@ See `tests/agent/test_prompt_builder.py::TestEnvironmentHints` for a worked exam
 Factual guidance about the host OS, user home, cwd, terminal backend, and shell (bash vs. PowerShell on Windows) is emitted from `agent/prompt_builder.py::build_environment_hints()`. This is also where the WSL hint and per-backend probe logic live. The convention:
 
 - **Local terminal backend** → emit host info (OS, `$HOME`, cwd) + Windows-specific notes (hostname ≠ username, `terminal` uses bash not PowerShell).
-- **Remote terminal backend** (anything in `_REMOTE_TERMINAL_BACKENDS`: `docker, singularity, modal, daytona, ssh, vercel_sandbox, managed_modal`) → **suppress** host info entirely and describe only the backend. A live `uname`/`whoami`/`pwd` probe runs inside the backend via `tools.environments.get_environment(...).execute(...)`, cached per process in `_BACKEND_PROBE_CACHE`, with a static fallback if the probe times out.
+- **Remote terminal backend** (anything in `_REMOTE_TERMINAL_BACKENDS`: `docker, singularity, modal, daytona, ssh, managed_modal`) → **suppress** host info entirely and describe only the backend. A live `uname`/`whoami`/`pwd` probe runs inside the backend via `tools.environments.get_environment(...).execute(...)`, cached per process in `_BACKEND_PROBE_CACHE`, with a static fallback if the probe times out.
 - **Key fact for prompt authoring:** when `TERMINAL_ENV != "local"`, *every* file tool (`read_file`, `write_file`, `patch`, `search_files`) runs inside the backend container, not on the host. The system prompt must never describe the host in that case — the agent can't touch it.
 
 Full design notes, the exact emitted strings, and testing pitfalls: