-- pg_turbovec 2.5.0 -> 2.6.0
-- 1-bit sign binary quantization (WITH (bit_width = 1)) now builds, scans,
-- inserts and vacuums. New index kind (KIND_BQ), no wire-version bump, no
-- REINDEX, no SQL surface change.
-- Intentionally empty but MUST exist so ALTER EXTENSION ... UPDATE succeeds.