- ArchitectureTest/InterfaceContractTest resolve modules via module.json instead
of the directory basename (works with {name}_{hash5}).
- ModuleLoaderTest: loads from a hash-suffixed dir; a broken module and its
dependents are skipped without aborting the whole load.
- ModuleManagerMigrationsTest: legacy bare -> hashed migration (+ stale-dup drop),
and install of a module living in a hash-suffixed directory.