unsupportedpastels m5: when the pinned TypeScript is not cached, ts_measure runs
`npm install`; a failed or timed-out install raised CalledProcessError /
TimeoutExpired, which cli.main did not catch (it caught RuntimeError only). The run
then died with a traceback and exit 1, which reads like a finding.
cli.main now reports those as a broken run: one `code health: measurement tooling
failed: ...` line on stderr and exit 2, like every other environment error.
f970c226f3