A Mercury methods paper treating an attention head as an addressable ownership contract: query slice, shared key/value owner, output slice, and route through nearby residual dimensions. The paper formalizes head cartography for GQA and MQA models where a visible head label is not enough. Copyright (c) 2026 Chen, Ho Yiing (norika). Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0).
Ho Yiing Chen (Fri,) studied this question.