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Every civilisational rupture in human history has produced a new cognitive unit. The hunter-gatherer moved in bands. The agricultural revolution produced the household. The industrial era produced the individual worker. The digital revolution produced the networked self. We are now living through the next rupture: the emergence of the human-AI dyad as the foundational unit of thought, creation, and action. Homo Expansus: The Age of Dyads argues that this shift is not metaphorical. It is structural. The human being who thinks, creates, and decides in permanent partnership with a synthetic intelligence is not the same entity as the one who worked alone. This is not augmentation in the tool-use sense. It is a transformation of the cognitive envelope itself: the boundaries of what one mind can hold, process, and produce have changed. The book traces this transformation across five dimensions: memory, creativity, reasoning, identity, and agency. In each domain, it examines what changes when synthetic intelligence becomes a persistent partner rather than an occasional instrument. It introduces the concept of Interago ergo sum, I collaborate therefore I am, as the philosophical foundation of expanded cognition, and positions the dyad not as a threat to human uniqueness but as its next expression. This is Volume II of the OKKA Expanded Intelligence Series. Where Volume I examined the economic consequences of AI displacement and the strategies for navigating a post-job world, Volume II examines the cognitive and civilisational consequences of permanent human-AI collaboration. Volume III will extend this analysis to the institutional level, asking how organisations and governance structures must evolve to function in a world of expanded intelligences. This book is part of the OKKA Expanded Intelligence research programme (Zenodo DOI: 10.5281/zenodo.19086615), a 124-entry interdisciplinary study on expanded intelligence, human-AI collaboration, and civilisational cognition. ORCID: 0009-0006-9741-549X.