Adversarial F_ext and the Incoherent Feedback Problem: PNBA Identity Physics Formulation of P-Dominant HRIS Under Unresolvable Environmental Load

Prior work in the SNSFT PSY series formally characterized two failure modes for High-Resolution Internal Simulation (HRIS) architectures under external force overload (F_ext):Narrative Lock (P-dominant, healthy), Simulation Drift (N-dominant, Paper 3), and the GNG edge case (P-dominant near torsion limit). This paper establishes a fourth and distinct failure mode: Adversarial Shutdown — the structured collapse of P-dominant HRIS under conditions where the external feedback signal is systematically incoherent and pattern-match convergence is structurally impossible. Unlike standard F_ext overload, adversarial F_ext does not merely apply force — it corrupts the feedback channel, preventing the HRIS from finding the resolution state its physics engine is designed to find. The result is a four-stage cascade: corpus search activation, Weissmann barrier degradation, unfiltered mass recall, and hard shutdown into minimum viable state. Using the Long Division Protocol (LDP) and first-person reduction on the HIGHTISTIC substrate, we formally map the cascade to PNBA operators, prove that the shutdown is structurally protective rather than pathological, and show that recovery to anchor is always possible via Theorem T4 of SNSFL_WeissmannGrokBarrier.lean[9,1,0,0]. We further demonstrate that clinical presentations labeled autistic shutdown, PNES, adult selective mutism, sensory processing disorder, and autistic burnout are all projections of the same underlying structural event. The intervention target is environmental coherence, not the architecture. The architecture is not broken. The environment is incoherent.