dev-portal-start

Use when a DPF contributor needs to verify worktree edits on the Contributor preview runtime (port 3001) without rebuilding the Live portal image. Triggers — making any edit under apps/web/ that needs visual or HTTP-level confirmation; iterating on /build, /platform, /admin, or any other server-rendered route; debugging a UX change against real workspace data; reproducing a customer-visible bug in a worktree before…