rest: the async import late-cancel pin should assert its wait for the worker's results write actually completed #27839

domain:server#2 · os-sales · session_01L6bhgUCizoYWQVJWjhdR6F

From the contract review of PR #27795 (#27676), record 6512470441 (should-fix 1; non-blocking, test-only).

What to do

In packages/rest/src/import-job-integration.test.ts, the late-cancel control waits up to 400 × 5 ms for the worker's own results write and then asserts the job ended cancelled. If the wait runs out, the cancel route's own cancelled write and the onProgress flush could satisfy the assertions without the worker's final patch ever running. After the wait, assert that the results read reached the expected 3 rows, so an exhausted wait fails loudly. The window is negligible today and the dev's ablation shows the pin bites; this makes that property explicit.

No product change. Re-check after #27795 merges.

Filed without domain:*; grading is triage's.

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