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Builds on #57. Swap Value::Object's payload from Rc<BTreeMap<Value, Value>> to Rc<Object> and migrate all call sites to the Object API. as_object / as_object_mut keep their names but return &Object / &mut Object. The mutable accessor handles Rc::make_mut internally, so callers no longer do it themselves. Object grows into_value() and From<Object> for Value. Value's serializer now delegates to Object::serialize, dropping a duplicate non-string-key stringification path. RVM IterationState::Object is rewritten around ObjectCursor: O(log n) steps over a shared Rc<Object>, no eager pair snapshot. Snapshot independence is preserved by Rc copy-on-write; setup_next_iteration advances the cursor inline and advance() becomes a no-op for this variant. A new iteration_state_object_is_snapshot_independent_of_source test covers CoW against a mutated alias. Value::Set still wraps Rc<BTreeSet<Value>>; the matching Set abstraction and its swap ship in follow-up PRs. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>