Joints engine: joint origins that snap to faces, round ends or points (re-found on every solve, so joints follow edits), joints (rigid, revolute, slider, cylindrical, pin-slot, planar, ball) with values, limits, flip and offset, As-built Joint, Rigid Group, Drive Joints, Motion Link, a joint-graph solver from grounded occurrences (degrees of freedom per occurrence, loop conflicts reported), Interference between bodies

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

crates/engine/src/cmd/mod.rs

@@ -12,6 +12,7 @@ mod features_more;
 pub use features::auto_operation;
 mod file;
 mod inspect;
+pub(crate) mod joints;
 mod measure_sel;
 mod section;
 pub(crate) use measure_sel::measure_items;
@@ -126,6 +127,7 @@ pub fn command_specs() -> Vec<&'static CommandSpec> {
     v.extend(features::COMMANDS.iter());
     v.extend(features_more::COMMANDS.iter());
     v.extend(component::COMMANDS.iter());
+    v.extend(joints::COMMANDS.iter());
     v.extend(browser::COMMANDS.iter());
     v.extend(edit::COMMANDS.iter());
     v.extend(clipboard::COMMANDS.iter());