The lab's check ran in the TypeScript toolchain, which holds no Go compiler,
so the replays register was never compiled before a merge. merge-check.sh now
declares replays/merge-check.sh as its Go part, which the build seat runs in
the Go toolchain: gofmt, go vet and the register's own tests. Both new
replays are proved: each fails on the commit before its fix and passes on it.
A merge-check.sh, the repository's layer of the mesh's merge check (mesh/repo-check), in
the TypeScript toolchain: install from the lock file, type-check, the unit suite. The
integration suite and the replays need a lab and the container runtime, which unapproved
code is not given: said as not run, never passed silently.
jochen