- WrennClient/AsyncWrennClient accept proxy_domain= and timeout= kwargs - WRENN_PROXY_DOMAIN env var supported - Default proxy host: app.wrenn.dev -> wrenn.dev (was port-id.app.wrenn.dev) - Custom base_url preserves host verbatim (with port) - Default timeout: httpx.Timeout(30.0, connect=10.0) - _build_proxy_url/_build_http_proxy_url take optional proxy_domain - code_runner proxy + WS URL builders thread proxy_domain through