- extend the silent-rollback contract to install-event.sh
- static contract: Restore-MultiSkillSet removes published paths lexically
(section-scoped so identity-anchor refactors keep the guarantee) and link
staging dirs are cleaned via Remove-LinkStageRoot / Remove-DevLinkStageRoot
- install-event.sh integration test: an uninstallable agent target is
skipped loudly while later agents still receive links
- pwsh probe: Test-SamePhysicalSkillRoot must dereference junctions and
symlinks (junction idempotency asserted where junctions are creatable)