-- pg_turbovec upgrade 2.1.0 -> 2.2.0 (MINOR)
--
-- Graph-kind scan-beam retune: the beam is now `turbovec.graph_ef`
-- (int, Userset, default 0 = auto = 512) rather than a side effect of
-- the candidate count (and therefore of `turbovec.hi_dim_rerank`).
--
-- This is entirely BINARY-side. A GUC is registered by the shared
-- library in _PG_init, not by SQL, so there are no new/changed SQL
-- objects: no new functions, no operator/opclass changes, no type
-- changes. Restart the backend after the UPDATE so _PG_init re-runs.
--
-- No wire-format change (stays v8). NO REINDEX required -- the beam is
-- resolved at scan time, so existing graph indexes honour the new
-- default immediately. Flat/IVF indexes are unaffected.