v1.2.0 The AID-719 adversarial gate (AID-725 through AID-732), on top of AID-717 taking the AEAT call out of the transaction, AID-710 hardening the chain-fork concurrency gate and wiring it into CI, AID-715 removing a gap lock from registry numbering, and AID-727 reconciling the duplicate state the agency actually returns. Minor: no breaking API change, no schema change, no new enum case. Conformance gate: larabill 1181 passed, clientes 1299 passed.