- Added `onInstanceInserted` callback to `InstanceMap` to notify when new instances are tracked, allowing `ChangeBatcher` to resolve pending unresolved Ref properties.
- Updated `createPatchSet` and `encodePatchUpdate` to support handling unresolved Ref properties, deferring their resolution until the target instance is available.
- Implemented logic in `ChangeBatcher` to manage pending unresolved Ref properties and re-queue them when the target instance is inserted.
- Introduced new tests to verify behavior with ambiguous paths and ensure stability when handling duplicate-named siblings.
These changes improve the handling of Ref properties in the system, enhancing synchronization reliability and robustness.
