* io/xref.rs — replaced the 7-line "BlockRecord::is_loaded turned out to
be unreliable" rationale with a one-liner. The reverted experiment
lives in git history (e88a946, 0996b75).
* refedit::RefEditSession.insert_handle — set at construction but never
read; the "kept for future REFCLOSE DISCARD" TODO can come back via
git history when that feature lands.
* scene::mod — dropped the placeholder MeshModel re-export; nothing
outside `mesh_model` consumes the bare name and MeshLodSet is the
pipeline-facing type now.
Co-Authored-By: Claude Opus 4.7 <[email protected]>