Project Aeterna: Foundational Theories and an Undisclosed Humanoid Embodied Platform for Future Extended Human-Machine Systems

Project Aeterna is a long-horizon framework exploring brain-state constraint, bodily-state interfacing, and future embodied continuity systems. This record contains a public overview white paper together with two foundational theory notes: (1) Brain State Constraint Theory, concerning time-structure-inspired acoustic phase-locked driving and reversible low-complexity neural states; and (2) SomaLink, concerning the possibility of a low-dimensional interface to distributed bodily state. In parallel with these theoretical directions, Project Aeterna has already completed the system-level design of an undisclosed humanoid embodied platform intended as a future carrier for extended human-machine interaction. Detailed architecture, implementation-sensitive design information, and intellectual-property-relevant technical content are not disclosed in this public release. This record is intended as a public-facing conceptual package for researchers, engineers, and interdisciplinary thinkers interested in neuromodulation, bodily-state decoding, human-machine interfaces, humanoid embodied systems, and long-horizon continuity frameworks.