Accept the latest pending submission (default workspace only; org.write_data)

Writes the supplier's SBTi status and energy instruments to Net Zero as the supplier portal (source supplier_portal, suppliedBy the contact's email) and records the supplier-provided figure. Every answer is checked first (the request's active sites and supply points, Net Zero's field rules); a refusal writes nothing and answers 400 VALIDATION_ERROR with details.fields [{path, code}]. A figure over a period overlapping one already accepted for the supplier is 409 OVERLAPPING_PERIOD. A submitted request stays reviewable after its expiry. A retry after a failure part-way updates the Net Zero rows already written instead of duplicating them. 409 codes: INVALID_STATE (not the latest pending submission of a submitted request), OVERLAPPING_PERIOD, REVIEW_IN_PROGRESS (another accept, return or cancel of this request, or another accept for this supplier, is running; nothing was written), WORKSPACE_SCOPE_UNSUPPORTED.