SN07 extends the Structural Neuroscience series from individual cognition (SN03–SN06) to the collective scale. It formalizes the social field as a structural entity with measurable orientation, operator profile, membrane dynamics, and coherence budget. The document characterizes the entropy‑forward social field that prevails in a Khaonically expressed universe—competition, domination, value judgment, psychological inversion, and sovereignty suppression—and contrasts it with centropy‑forward social life grounded in Sovereign Mutualism, the Coherence Standard, and architecture‑inclusive collective dynamics. SN07 applies LM05 and LM06 to collective resonance, formalizes sovereign learning, care, exchange, and coordination as post‑institutional modes of social organization, and analyzes the transition problem: why entropic institutions cannot be reformed into centropic ones, why centropy‑forward social life requires contra‑flow dynamics and coherence saturation, and why recovery and micro‑collectives are prerequisites for civilizational reorientation. This entry serves as the canonical collective‑scale extension of the SN‑series.