Refuse fillets and chamfers that run past their faces or cross each other (#1080) (#1124)

* Refuse fillets and chamfers that run past their faces or cross each other (#1080)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Blend fit: chamfers keep their old acceptance of crossed loops; skip the volume bound along tangent chains

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Blend fit: one selection per check, a coarse volume pass first; record the refused oversize blends in the action matrix baseline

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/kernel/src/lib.rs

@@ -14,6 +14,7 @@
 
 mod blend;
 mod blend_corner;
+mod blend_fit;
 mod blend_variable;
 mod blend_vertex;
 mod body;
@@ -40,6 +41,8 @@ mod iges_out;
 #[cfg(test)]
 mod intersection_curve_tests;
 #[cfg(test)]
+mod issue_1080_tests;
+#[cfg(test)]
 mod issue_616_tests;
 #[cfg(test)]
 mod issue_674_tests;