Representation-Aware Unlearning via Activation Signatures: From Suppression to Knowledge-Signature Erasure. - Syed Naveed Mahmood; Md. Rezaur Rahman Bhuiyan; Tasfia Zaman; Jareen Tasneem Khondaker; Md. Sameer Sakib; K. M. Shadman Wadith; Nazia Tasnim; Farig Sadeque (CoRR, 2026)