fem: pyramid5 element (solver, quality, decks, VTK)

A five-node pyramid, the conforming transition between a hexahedron's face
and tetrahedra: Bedrosian's rational shape functions with a collapsed (Duffy)
Gauss rule, a certified Jacobian on the base square with exact volume, a
scaled Jacobian, C3D5 / CPYRAM / LS-DYNA degenerate solid, VTK_PYRAMID and
the binary mesh code 13. A distorted hex8-pyramid5-tet4 transition mesh
passes the patch test and uniaxial tension exactly.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo

crates/decks/tests/abaqus.rs

@@ -461,10 +461,11 @@ fn written_connectivity_has_a_positive_jacobian_in_abaqus_conventions() {
 #[test]
 fn model_faces_are_abaqus_faces() {
     // Each face's node positions (1-based, Abaqus element library, our transcription).
-    let table: [(ElementKind, &[&[usize]]); 3] = [
+    let table: [(ElementKind, &[&[usize]]); 4] = [
         (ElementKind::Hex8, &[&[1, 2, 3, 4], &[5, 8, 7, 6], &[1, 5, 6, 2], &[2, 6, 7, 3], &[3, 7, 8, 4], &[4, 8, 5, 1]]),
         (ElementKind::Tet4, &[&[1, 2, 3], &[1, 4, 2], &[2, 4, 3], &[3, 4, 1]]),
         (ElementKind::Wedge6, &[&[1, 2, 3], &[4, 6, 5], &[1, 4, 5, 2], &[2, 5, 6, 3], &[3, 6, 4, 1]]),
+        (ElementKind::Pyramid5, &[&[1, 2, 3, 4], &[1, 5, 2], &[2, 5, 3], &[3, 5, 4], &[4, 5, 1]]),
     ];
     for (kind, faces) in table {
         assert_eq!(kind.faces().len(), faces.len());