beel-es Company Representation API
The AEAT fiscal representation of a company as a sub-resource of the company itself, addressed by `/v1/companies/{company_id}/representation`. The NIF in the path is the only source of context: the account that owns it is derived from it. It is the canonical form of the operations that `PublicCompanyRepresentations` still exposes under `/v1/accounts/{account_id}/companies/{company_id}/representation/…`, reshaped as one REST resource — `GET` reads the state, `POST` creates the document, `DELETE` cancels it — instead of five verbs in the URL.