1@README.md
2
3- **Majors are listed once, in `PG_MAJORS` in `build/defs.bzl`.** The
4  constraint values, the platforms, the test twins, the Cargo features and
5  the nix package sets all derive from it; never write a major here.
6- **The remote cache stays opt-in.** `remote_cache` is false unless the
7  machine's own buckconfig sets `[buildbuddy] cache = true`; the repository
8  must build with no cache and no credentials anywhere else.
9- **`execution.bzl` is kept identical across the estate's buck2 repos on
10  purpose;** change it everywhere or nowhere.