rightkit-fs
Safe filesystem state for Right Suite apps: descriptor-pinned state directories
(StateDir), atomic writes (atomic_write, AtomicWriter), cross-process locks
(FileLock), owner-only files (write_private_file, ensure_private_dir), and
stable file identity across renames (IdentityStore).
See API.md in the lane folder for the per-app migration table. Unix operations
are descriptor-relative; Windows operations are handle-relative and refuse reparse
points. Ancestor replacement cannot redirect a pinned state directory.