Number.parseInt accepts a numeric prefix, so values like 1.5 or 8junk
silently ran an unintended worker count. Require the full string to
round-trip (same pattern as run-gates' positiveIntArg).
verify-built-package-invariants ran 100+ npm-pack + plain-Node probes
serially, dominating the CI artifacts lane (~4min of a ~5min job; ~7.5min
on Windows). Each probe stages its packed view inside its own package and
spawns its own processes, so the probes are independent — run them through
the same bounded worker pool shape as publint-all, capped by
DSH_BUILT_INVARIANTS_CONCURRENCY (default availableParallelism), failures
kept in manifest order.
Measured on the gate alone: 2m07s serial -> 17s at concurrency 8.
CI lanes pin the cap to 8, matching DSH_PUBLINT_CONCURRENCY.
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