formatter.test.ts, format-default.test.ts, sync-executor.test.ts, and
session-creator.test.ts use mock.module() which pollutes bun's module
cache. Previously they ran both in the isolated step AND again in the
remaining tests step (via src/cli and src/tools wildcards), causing
cross-file contamination failures.
Now the remaining tests step enumerates subdirectories explicitly,
excluding the 4 mock-heavy files that are already run in isolation.
c8bc267127