mesh-build-go: a reads-outside marker lists what its tests read, so its package is kept until one of those files changes (issue 1936)

47 packages carried the marker and were never kept: about 2000 tests per level ran on every check, whatever it
changed. The marker now lists, as paths or globs from the repository's root (? before a path whose absence is read),
what the package's tests read outside it; the digest hashes those files with the package's own non-Go files. A marker
that lists nothing, names an unclean path, or a line that matches nothing keeps today's never-kept digest.

The 46 markers list their reads; checks/deps and checks/trunk lose theirs (their tests read only temporary
directories). Digest form 6.

Quick fix of issue 1936, chosen by the operator 2026-10-26 21:56; the thorough fix (the Go test log's files kept with
each verdict) stays on the issue.

modules/postgres/cmd/postgres-provider/reads-outside

@@ -1 +1,5 @@
-These tests read other catalogue modules' files, outside this module (issue 1935): never kept.
+# What these tests read outside their package, as paths from the repository's root (a glob, or a directory read whole;
+# ? before a path whose absence is read). mesh-build-go hashes them into the package's digest, so its verdict is kept
+# until one of them changes (issue 1936). An empty list, or a line matching nothing, keeps nothing.
+# every manifest.
+modules/*/module.json