crabbox-setup — an isolated cloud box per agent

dev-local-setup gives you one local stack. But the loop-engineer model runs many loops in parallel, and you can't run N full stacks on one laptop — fixed ports, one Docker daemon, one shared DB; worktrees don't fix that (they still share the host). This skill is the cloud/parallel counterpart: a fresh isolated box per agent (own DB + dev server), driven by an in-box browser, so concurrent code loops verify their work without colliding — laptop at ~0% CPU.

Written for Daytona (snapshot-based, the proven path); notes for SSH-lease providers (Hetzner/AWS) at the end. It composes with the rest of the harness:

• reuse dev-local-setup's service/port discovery — don't re-discover.
• run the e2e-setup specs on the box as the verification.

You are SCAFFOLDING files into the target repo. Templates live in assets/ (next to this skill); copy them in and ADAPT (every one has # EDIT: markers).