forked from 1b-agent/fieldcraft-upstream
model.boundary_condition.symmetry takes a datum plane of any orientation, finds the faces on it and reports the plane's unit normal when it is inclined; the glyph draws a support along that normal. Verified: half a plate cut on its diagonal with the plane deflects as the half mirrored across it (6.7e-13), the mirror conforming on the plane. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo