Driver: E~ = (m/M)^D (v1/v2)^(D-1) F~ = tau^2 (m/M) ⊙ (a / (x - x_c)) (componentwise, 2D here) S = tanh(lambda · (F~x + F~y)/2), memory M ← (1−mu)M + muS.
Geometry: shell speed and aperture respond to observer-local effective input speeds, dimensionless energy, and structural force memory.
Life-field: detectors self-link into an electrical lattice while the walker curves around a structural reference centre.