Título: GaIA IP — Addenda R19, R20, R21: SIVA, D-Commerce, Black Box / Violet Box 4.Autores: Antonio Alberto Lopes Elias (ORCID: 0000-0002-5602-9916)

Description: Fourth, Fifth and Sixth formal addenda to GaIA IP (DOI: 10.5281/zenodo.19170437). R19 SIVA — Sovereign In-device Voice Architecture. R20 D-Commerce — Data as Personal Asset with Negotiable Consent. R21 Black Box / Violet Box — Dual Sovereign Context Architecture. Independently conceived by Antonio Alberto Lopes Elias on March 29, 2026.