-- pg_turbovec v1.15.1 -- cross-version build fix (pg13/14/15/18).
--
-- This file is a *reference mirror*. The authoritative install
-- script is generated by `cargo pgrx schema`.
--
-- v1.15.1 fixes a cross-PG-version BUILD regression introduced in
-- v1.12.0 (the Phase B-4 out-of-core IVF build): the BufFile corpus
-- spill called pg_sys::BufFileReadExact (which only exists in PG16+)
-- and passed BufFileWrite a *const pointer (PG13-15 declare it
-- *mut). The extension compiled on pg16/pg17 (the local dev target)
-- but FAILED TO COMPILE on pg13, pg14, pg15, and pg18 -- silently
-- breaking those CI matrix legs from v1.12.0 through v1.15.0.
--
-- The fix wraps both calls in version-gated shims (buffile_write /
-- buffile_read_exact in src/index/build.rs) so the corpus spill
-- builds across the full pg13..pg18 matrix. BufFileRead (present on
-- every version) backs the read shim with an explicit short-read
-- check. A new scripts/compile-matrix.sh `cargo check`s every PG
-- feature and is wired into the pre-push hook so this class of
-- version-specific API break is caught locally before tagging.
--
-- This is a BUILD-ONLY fix. On pg16/pg17 (where v1.12.0-v1.15.0
-- already compiled) the runtime behaviour and the on-disk relfile
-- are UNCHANGED (MetaPageData::version = 4). There is no DDL, no
-- on-disk migration, and NO REINDEX. `ALTER EXTENSION pg_turbovec
-- UPDATE TO '1.15.1';` resolves against this intentionally-empty
-- file.