Sandbox SDK — (1.0 preview) Isolated Linux environments on Cloudflare Containers, driven from Workers. Prefer preview docs and installed types over memory. APIs change; this skill is a gate, a contract, and a retrieval map—not a full manual. We recommend new projects on this line. Apps still on the default package use . Port only when asked, via . 1. Gate — confirm the package line Before writing code, inspect the app: | Check | Must match | | ----- | ---------- | | npm dependency | (or another preview tag) | | Container image | Same line (e.g. , ) | | If you find… | Action | | ------------ |…