geometry: persistent names of B-rep vertices (#346)

A vertex is named after the faces that meet there, sorted and joined by |
as edges are, numbered ~k where several touch the same faces.

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

crates/geometry/src/lib.rs

@@ -25,7 +25,7 @@ pub mod sample;
 mod script;
 
 pub use design::{Design, FeatureError, MAX_DESIGN_BYTES, open_design};
-pub use edges::{EDGE_TOLERANCE, Edge};
+pub use edges::{EDGE_TOLERANCE, Edge, Vertex};
 pub use partition::{Cut, CutReport};
 pub mod tagged_mesh;
 #[cfg(feature = "scripts")]