Closes#1943
Find Usages and Rename use document-indexer definitions and references next to language-server results. An indexed rename previews every name anchor and applies through the existing atomic workspace edit with grouped undo, guarded by index synchronization, canonical paths and document snapshots; a superseded rename preparation can't revive an obsolete session. Language-server Find Usages and Rename are unchanged. Released WIT is unchanged.
Co-authored-by: arnaud-ritti <[email protected]>
