Error
Catalog
Create a taxonomy axis
Creates one classification axis under a caller-supplied id, optionally with an initial node tree (roots defaults to empty). 409s when the id already exists; 400s on a bad scope/source enum or an empty name.
POST
Error
Authorizations
Authorization: Bearer <token>. Accepts EITHER a Keycloak access token (scopes-in-token) OR an opaque POS session token; both resolve to the same pos.* scope vocabulary the route guards enforce.
Body
application/json

