Sketch constraints and dimensions: Curvature (G2, ConstraintSmooth) and Polygon constraints; redundant constraints and dimensions are refused as over-constraining (Fusion behaviour), with driven (reference) dimensions that measure instead; arc length and linear diameter (about a centerline) dimensions; sketch.glyphs (constraint glyph anchors, conflicts) and sketch.snap (coincident/midpoint/on-curve/horizontal/vertical inference); solver damping floor keeps weakly seen variables from flying off

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

crates/engine/src/cmd/mod.rs

@@ -10,6 +10,7 @@ pub use features::auto_operation;
 mod file;
 mod inspect;
 mod sketch;
+mod sketch_constraints;
 mod sketch_create;
 mod sketch_modify;
 mod sketch_project;
@@ -110,6 +111,7 @@ pub fn command_specs() -> Vec<&'static CommandSpec> {
     let mut v: Vec<&'static CommandSpec> = Vec::new();
     v.extend(sketch::COMMANDS.iter());
     v.extend(sketch_create::COMMANDS.iter());
+    v.extend(sketch_constraints::COMMANDS.iter());
     v.extend(sketch_modify::COMMANDS.iter());
     v.extend(sketch_project::COMMANDS.iter());
     v.extend(features::COMMANDS.iter());