-- pg_turbovec 2.2.2 -> 2.3.0
-- WAL amplification fix: an index flush now only WAL-logs the pages whose
-- contents actually changed (previously every flush wrote a full-page image of
-- the entire index relfile, ~500 MB of WAL per commit on an 882 MB index).
-- Code-only: no wire change (v8), no SQL surface change, no REINDEX.
-- Intentionally empty but MUST exist so ALTER EXTENSION ... UPDATE succeeds.