Couple test-worker arguments to the executable selected by the shared subprocess helper and migrate its runtime-dependent callers. Repair command parsing, runtime pinning, worker observation, storage settlement, and cleanup-clock fixtures while preserving their contracts.
Fourteen scoped suites pass on Node 24 and Bun; the Bun readSync gap remains an unchanged stop. Refreshed proof covers 638 passed/1 existing skip on Node and 636 passed/3 existing skips on Bun. P2 review and exact-head ClawSweeper found no actionable defects. Production LOC delta is zero.
The first CI head exposed an inherited UI-validator fixture omission. After incorporating its existing main fix, exact-head CI passed, including the published-driver update job. No same-head retry or admin exception was used.