engine: geometry.defeature takes features out of the design for meshing (#433)

Suppresses the SolidCraft features named (holes filled, fillets and chamfers back to
their sharp edges, bosses removed) and rebuilds the design; a feature that cannot be
suppressed alone is merged into its neighbour for meshing only. Kept in the model,
replayed on open, undoable; geometry.defeature.delete turns them back on.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo

crates/engine/src/catalogue.rs

@@ -317,6 +317,14 @@ pub static CATALOGUE: &[Capability] = &[
         "Split a face along a datum plane for meshing only: two faces on its surface, the cut an edge between them",
         &["geometry.face.split.delete"],
     ),
+    covering(
+        "geometry.defeature",
+        "Defeature",
+        Geometry,
+        "Prepare",
+        "Take small holes, fillets, chamfers and bosses out for meshing: the design rebuilt without their features",
+        &["geometry.defeature.delete"],
+    ),
     covering(
         "geometry.stitch",
         "Stitch",