agyloop-agent-sdklisted

# agyloop + google-antigravity `infrastructure/agent/` is the only place `google.antigravity` may be imported. - Default gateway is the SDK (`Agent` + `LocalAgentConfig`). `--gateway cli` shells out to `agy`. - Autonomy: `policy.allow_all()` plus workspace/destructive scopes. Interactive hooks are never registered. `ask_question` is denied with guidance. - `--unsafe-skip-permissions` is refused on the SDK path. - Live config pins `mcp_servers=[]` (OAuth cannot complete unattended). - Additive `system_instructions` only — never `CustomSystemInstructions`. - Input detection in Go `localharness` hardcodes withdrawn `gemini-2.5-flash-lite`. agyloop retargets via env + extra `ModelTarget`, then a copy-patch (`ANTIGRAVITY_HARNESS_PATH`), then monkeypatch / site-packages backup / localhost rewrite proxy. See `docs/contributing/harness-patch.md`. - Empty drain + 404 / `NOT_FOUND` / "no longer available to new users" in harness logs → `AgentConfigError`, not Available.