Two marketplaces shipping a plugin of the same name shared one
"plugin:<key>" state record, so every sync reinstalled one copy and
reported it updated, and removing one marketplace never uninstalled its
copy. Plugin state ids are now "plugin:<slug>/<key>"; the slug and key
for an uninstall are derived from the id and re-validated. Older
"plugin:<key>" records are migrated using their recorded slug, so
existing installs are neither reinstalled nor orphaned. Reports keep
"plugin:<key>".
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>