mesh: node relaxation with UV surface slides and relaxation fields (#398)

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

crates/mesh/src/lib.rs

@@ -18,6 +18,7 @@ pub mod octree;
 pub mod planar;
 pub mod quad;
 pub mod quality;
+pub mod relax;
 pub mod seeds;
 pub mod size;
 pub mod surface;