Sheet metal: rules as expressions (Thickness, K-factor, bend radius, reliefs, gaps; may use parameters), sheet bodies kept as flat patterns and sewn folded from exact faces (new kernel::sew), Flange (base, edge with height to the outer face, angle, inside/outside/middle, several edges at once with corners closed to the rule gap, contour from an open chain), Hem, Unfold/Refold with cut-outs that follow the bends, Convert to Sheet Metal, flat pattern with bend lines and bend table, DXF export; recipes: sm_flange, sm_hem, unfold/refold, rule edits (oracle 67-76 all pass)

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

crates/engine/src/cmd/mod.rs

@@ -17,6 +17,7 @@ mod measure_sel;
 mod section;
 pub(crate) use measure_sel::measure_items;
 mod parameters;
+mod sheet;
 mod sketch;
 mod sketch_constraints;
 mod sketch_create;
@@ -127,6 +128,7 @@ pub fn command_specs() -> Vec<&'static CommandSpec> {
     v.extend(sketch_project::COMMANDS.iter());
     v.extend(features::COMMANDS.iter());
     v.extend(features_more::COMMANDS.iter());
+    v.extend(sheet::COMMANDS.iter());
     v.extend(component::COMMANDS.iter());
     v.extend(joints::COMMANDS.iter());
     v.extend(browser::COMMANDS.iter());