-- pg_turbovec 2.7.6 -> 2.8.0
-- Benchmark/documentation release: the 1M IVF+BQ crossover measured on a real
-- corpus, lists=4096 shown worse than lists=1024, the GT harness parallelised
-- (ground truth verified row-for-row identical), and the v2.7.4 contended-
-- latency caveat resolved with a clean re-run.
-- No wire change (v8), no SQL surface change, no REINDEX.
-- Intentionally empty but MUST exist so ALTER EXTENSION ... UPDATE succeeds.