Sketch Blend Curve (tangent control-point spline between two curve ends) and the Centerline line type (sketch.centerline: left out of profiles, drawn as an axis)

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

crates/sketch/src/profiles.rs

@@ -107,7 +107,7 @@ pub fn find_profiles(sk: &Sketch) -> Vec<Profile> {
     // Analytic shapes of the profile curves.
     let mut shapes: Vec<(usize, Shape)> = Vec::new();
     for (ci, c) in sk.curves.iter().enumerate() {
-        if c.construction {
+        if c.construction || c.centerline {
             continue;
         }
         match c.kind {