FairePlace Estate Diagnostics API
Estate diagnostic documents management (lead, asbestos, electrical, gas, risk assessment, co-ownership rules). Diagnostics are attached to a property (estate) and can be automatically linked to lease annexes via the `POST /leases/{lease_id}/annexes/attach-mandatory` endpoint. Only one active diagnostic per type per estate is allowed. Creating a new diagnostic of the same type automatically deactivates the previous one.