The transform used `s,^\./,workspace/,`, which rewrites the workspace
*contents* (`./foo` -> `workspace/foo`) but leaves tar's root member as a
bare `./`. That `./` entry carries the source root's mode/mtime, and on
extraction tar stamps them onto the extraction directory itself.
Match the leading `.` instead (`s,^\.,workspace,`) so the root member is
renamed `./` -> `workspace`, giving the archive a proper `workspace/`
directory entry and no bare `./`. The extraction directory is left
untouched. Contents, hidden files, excludes, symlink targets and the
`flags=rh` hardlink handling are unchanged.
Verified in-container: archive top level is exactly `workspace/` +
`home-claude/`, no `./` member, node_modules excluded, extraction into a
0755 dir leaves it 0755, workspace/.git preserved.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
shadow-test