H-108 inherits the exact dependency/physics chain from H-107/H-104/H-103/H-100/H-089.

New optimization-only code:
  h108_exact_lazy_wedge_generation_audit.py

Frozen physics:
  p = 0
  H-089 WALL_CONTINUOUS
  sqrt(current-cell convergence) * sin(theta)^3
  K = 8.6816265415871847e-05
  current active FrostCell only
  no GR/Newton/planetary labels

H-108 computational change:
  * No learned surrogate.
  * Small proof: solve the exact cubic u_x quotient wedge directly from the
    symmetry-clean spherical source using the inherited six-neighbour equation.
  * High-R audit: pack the exact symmetry-clean field directly to a disk-backed
    u_x wedge, delete the full cube, and page only current-cell values during
    H-089 transit.

Scientific limitation:
  The high-R disk wedge is still generated from a full reference field in H-108.
  The small wedge-only proof establishes reduced-domain equation closure; a
  scalable wedge-only production solver is the next engineering step.
