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/engine/src/tests.rs

@@ -274,6 +274,7 @@ fn join_of_a_lobed_disc_pattern_is_not_refused() {
     assert!(rel(got, want) < 1e-3, "{got} vs {want}");
 }
 
+mod blend_fit;
 mod boolean_diagnostics;
 mod component_frames;
 mod large_step_import;