The scan now reads exactly the manifests the release tooling rewrites, names
every directory and file it cannot read, and refuses an empty corpus; the
command takes the root it checks so the exit code is tested, and the workflow
reports a crashed check as a warning in report mode.
`Policy / Pre-Merge Check` now runs `scripts/pre-merge-check.ts` under plain
Node and knows nothing else about the merged tree. That script installs the
dependencies, checks that every released manifest carries the root version
while the install runs, and builds the Host and Client contracts, reporting
which step failed.
imccyu