geometry: the replayed feature graph per body (#402); a partition may list a cut body for its cells

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

Cargo.lock

@@ -1356,6 +1356,7 @@ version = "0.6.0"
 dependencies = [
  "fieldcraft-model",
  "quick-xml 0.42.0",
+ "serde",
  "serde_json",
  "solidcraft-doc",
  "solidcraft-engine",