bin/restore-policies.sh used readarray (bash 4+), which fails on macOS
bash 3.2. Replace with a compatible while-read loop.
machineId.test.ts disableWindowsRegistryStrategy() did not neutralize
the macOS ioreg strategy, so mocked os.hostname() was never reached
on macOS and both ladder tests failed. Stub execSync for ioreg commands
so the fallback chain reaches os.hostname() as intended.
Production src/shared/utils/machineId.ts is correct and unchanged.
70b7697ab7