H-104 dependency / firewall chain
=================================

Retained exact mechanics:
- h049_numerical_instrument_convergence.py
    inherited p=0 finite Dirichlet/DST field and fractional spherical source
- h084_sin_power_resolution_destruction_attack.py
    axis cases / source-free current-cell geometry chain
- h088_signed_residual_finite_cell_attack.py
    frozen K and frozen sqrt(convergence)*sin^3 current-cell steering
- h089_wall_to_wall_continuous_transit_control.py
    frozen H-089 WALL_CONTINUOUS transit
- h100_single_high_r_tail_probe.py
    validated memory-lean R65 exact field allocation
- h103_exact_cubic_symmetry_wedge_audit.py
    cubic source-symmetry/orbit helpers only

H-104 adds computational representations only:
- packed u_x wedge x>=0, y>=z>=0;
- on-demand vector reconstruction from that wedge;
- query/working-set counters;
- diagnostic perfect-sphere source-sampler cleanup by cubic-orbit averaging.

The source cleanup changes no FV law; it removes the numerical asymmetry H-103
identified in the computerized fractional-sphere sampler. H-104 separately keeps
the untouched inherited R65 branch so its effect is measured rather than hidden.

No GR scorer is called. No fit or retuning occurs. The compact field supplies the
same FrostNode displacement interface to the same frozen current-cell transit.
Planetary/Jupiter holdouts remain sealed.
