engine: friction output of implicit contact

solve.nonlinear counts the slipping nodes, solve.probe gives a secondary node's shear traction
and slip, and the results display draws contact_shear and contact_slip, contact_status coding
stick and slip.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-14 15:14:14 -04:00
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@@ -20,7 +20,7 @@ pub const DEFORMED: CommandSpec = CommandSpec {
pub const CONTOUR: CommandSpec = CommandSpec {
id: "results.contour",
label: "Contours",
params: r#"{"step": "Load", "field": "von_mises", "bands": 12} — contours of a nodal field: displacement, displacement_x/y/z, von_mises, max/mid/min_principal, stress_xx/yy/zz/xy/xz/yz (stresses for static steps), contact_pressure, contact_gap, contact_status (0 open, 1 closed; nonlinear static steps with contact, at the contacts' secondary surfaces); "none" turns them off; 2 to 24 bands"#,
params: r#"{"step": "Load", "field": "von_mises", "bands": 12} — contours of a nodal field: displacement, displacement_x/y/z, von_mises, max/mid/min_principal, stress_xx/yy/zz/xy/xz/yz (stresses for static steps), contact_pressure, contact_gap, contact_status (0 open, 1 closed or stick, 2 slip), contact_shear, contact_slip (friction; nonlinear static steps with contact, at the contacts' secondary surfaces); "none" turns them off; 2 to 24 bands"#,
form: Some(super::forms::CONTOUR),
kind: CommandKind::Session,
run: contour,