Add the modelcraft-mesh crate (empty: error type only) (#3)

So the predicates and quality tasks can add modules in parallel without both creating the crate.


Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

Co-authored-by: jyviko <[email protected]>
Co-authored-by: Claude Opus 5.5 <[email protected]>

Cargo.toml

@@ -14,6 +14,7 @@ repository = "https://github.com/jyviko/modelcraft"
 # internal
 modelcraft-model = { path = "crates/model" }
 modelcraft-geometry = { path = "crates/geometry" }
+modelcraft-mesh = { path = "crates/mesh" }
 modelcraft-engine = { path = "crates/engine" }
 
 # foundation