Transforming over 1000 vertices to C_CONTIGUOUS.
Transforming over 1000 elements to C_CONTIGUOUS.
================================================================================
 OpenSees three-way cross-check: case=gravity, site=baseline
================================================================================

Mesh: reports/full_dome_merged.vtu
  N_nodes = 20,187
  N_tets  = 57,725
  reorient_tets: flipped 17/57725 tets (0.0%)
  Clamp NSET (y < 50.0 mm): 163 nodes

Material: E=70.80 MPa, nu=0.3, rho=240.0 kg/m^3
Pressure: +0 Pa  (sign convention: + = compressive on outer face)
  skfem-convention value:     +0 Pa  (+ = outward push)

--- scikit-fem solve ---
[skfem]       3.0 s   |u|max=30.002  |u|p99=11.926  VMmax=4456.2807  VMp99=1.5433  sigma_t_max=+92991.6617  sigma_c_min=-150.7437

--- CalculiX solve ---
[ccx]         1.1 s   |u|max=6.886  |u|p99=6.886*  VMmax=0.1488  VMp99=0.0472  sigma_t_max=+0.1476  sigma_c_min=-0.1809
           (* ccx wrapper reports only scalar |u|max; p99 column duplicates max for this solver)

--- OpenSees solve ---
[opensees]    1.0 s   |u|max=6.886  |u|p99=6.138  VMmax=0.1488  VMp99=0.0472  sigma_t_max=+0.1476  sigma_c_min=-0.1809

============ AGREEMENT ============
  metric                      skfem        ccx     opensees   max diff %
  ----------------------------------------------------------------------
  |u|  p99 [mm]              11.926      6.886        6.138         48.5
  |u|  max [mm]              30.002      6.886        6.886         77.0
  VM   p99 [MPa]             1.5433     0.0472       0.0472         96.9
  sigma_t max [MPa]      92991.6617     0.1476       0.1476        100.0
  sigma_c min [MPa]       -150.7437    -0.1809      -0.1809         99.9

VERDICT: FAIL  (criteria: |u|p99 diff <= 5%, VM p99 diff <= 10%)
  - |u| p99 max-diff:     48.5 %  [FAIL]
  - VM  p99 max-diff:     96.9 %  [FAIL]
  - sigma sign agreement: [yes]  (sigma_t: skfem=+, ccx=+, opensees=+; sigma_c: skfem=-, ccx=-, opensees=-)

  Note: FAIL on this mesh is the documented status quo (NEXT_STEPS.md #1: skfem-vs-ccx p99 VM disagree by ~90% on
  the merged mesh, likely sliver-tet artefacts at joints). OpenSees acts as tiebreaker. The table above is the value;
  this tool intentionally does NOT abort on FAIL.