-- pg_turbovec 2.7.4 -> 2.7.5
-- Documentation/benchmark release; binary byte-identical to 2.7.4. Publishes
-- the 1-bit dimension sweep (penalty collapses 125x -> 25x -> 8x as dim rises;
-- 1-bit is a high-dimension technique) and corrects a hi_dim_rerank doc error
-- (the 1-bit special case is a no-op at dim >= 256).
-- No wire change (v8), no SQL surface change, no REINDEX.
-- Intentionally empty but MUST exist so ALTER EXTENSION ... UPDATE succeeds.