X_REGISTRAR_MISSING
Means
no registrar is loaded for a primitive kind
Typical cause
the owning package is absent from the graph, so nothing announced a registrar — defineApi({ queries }) without @ultimat3/query. meta.kind names the kind, and a kind is not a package name: action and mutator → @ultimat3/action, job and task → @ultimat3/jobs, route → @ultimat3/render, entity, policy, query → their own. Importing the owner is what announces
Fix
bun add <owning package> — e.g. bun add @ultimat3/jobs for a missing task registrar; the error's own fix: names it