Under the hood
Directory sync's internal git worker was reworked with memoized checks and session-tagged 'kept' refs
What
The background worker that handles git operations for directory sync had its internal logic reshuffled. It now uses two new memoized (cached) helper functions to check whether a git "basis" (a known starting point) matches a given commit, or matches a given index and working-tree state, and a new function tags a git ref by session ID as "kept" before falling back to discarding a temporary index.
Why
This is an internal restructuring of directory sync's git handling; the finding doesn't indicate a user-visible behavior change beyond how these checks are computed internally.