v0.4.1

Upgrade notes

Run npx @3metajun/mstack@0.4.1 --harness all --migrate --replace --dry-run
to inspect the migration, then repeat without --dry-run. Recognized legacy
copies are backed up outside skill discovery roots. Unrecognized local
copies stop migration before writes. SSH migration must run locally on the
target machine.

Fixes

• Share one canonical skill copy across Codex, OpenCode and pi. Claude keeps
  its adapter and derives skill names from directories, so OpenCode skips its
  duplicate copy without changing global settings.
• Migrate legacy copies, archived backups and interrupted stages with retained
  originals and rollback. Validate physical path aliases before writing.
• Keep agent definitions in native directories and shared tools beside their
  skills. Deduplicate compatible explicit and remote targets.
• Reuse target resolution in the installer and smoke checks so OpenCode and pi
  checks inspect the shared installation.

Publication

This release includes the tested npm tarball. npm publication is pending and will be performed separately by the maintainer. The upgrade command above applies after publication.

Includes #18 and the shared installer/smoke path-resolution improvement identified in #17.