Curvature Comb Analysis (FusionCurvatureCombAnalysisCommand): combs on sketch curves (exact, from their Bézier/conic pieces) and model edges, with minimum radius; interactive tool draws teeth and envelope; ignored large-sketch timing test (sketch_perf)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/engine/src/cmd/sketch_constraints.rs

@@ -528,3 +528,7 @@ mod tests;
 #[cfg(test)]
 #[path = "sketch_fuzz_tests.rs"]
 mod fuzz;
+
+#[cfg(test)]
+#[path = "sketch_perf_tests.rs"]
+mod perf;