Track created directory and file identities before materializing or removing output. Refuse displaced paths and untracked entries, preserve completed cleanup work across permission failures, and prevent publication once rollback starts. Group cleanup files once per attempt instead of rescanning them for every directory.
Validation: root, nested-parent, and file symlink replacement; untracked-entry retention; real POSIX permission failure and retry; extraction integrity and CLI/MCP consumers pass. Path identity revalidation cannot eliminate syscall-boundary pathname races in portable Node. Windows behavior was simulated; native Windows and Linux-only publication providers were not exercised.
SafeOutputTree.create() called fchmod(0o700) on a directory handle and
commit() fsynced a directory handle. Both are POSIX-only: Windows rejects
them with EPERM ("operation not permitted, fchmod"/"fsync"), so every
extract_artifact call failed with a generic io error and produced no output.
Skip the redundant directory chmod and directory fsync on Windows. mkdir
already applies the requested mode, and file contents are synced in write().
Add a Windows regression test and run it, plus the archive-safety test, in
the curated Windows CI lane so the behavior is covered.
morluto