fieldOwner(actor) maps every non-plugin actor to "user" wherever field_sources is written (entries, engagements, list ownership from history), so syncs never overwrite a field an API token edited. authenticateAppToken also returns the token name; revokeAppToken reports whether it revoked; listSuggestions queries the canonical work id. Co-Authored-By: Claude Opus 5.5 <[email protected]>