test/crew-sandbox-real.test.ts runs on the check host's shape, or its exclusion names the exact cause #10743

A six-line deletion that does what box 1 asks: the file now runs in the gate. It touches no UI, so the preview is unaffected. The test already skips by name when no sandbox can be made and fails when the runtime is missing, so the deletion is safe on hosts that cannot make one. Two things next: (1) put the three consecutive green check-cell runs in the pull description, since the diff alone cannot show them; (2) if the file ever goes red on the check host, re-add the entry with the one concrete cause rather than a vague reason. I could not run the file under the check cell limits from my sandbox, so I rely on the green check for this head.