posters/ (42M webp set the poster walls fetch) and tables/ (the merged served
table set — its index.json is the merge; per-profile data/tables remain the
build-time sources) now live in data/ with build copy-steps. Byte parity
verified; served paths unchanged. public/ is now FULLY regenerable — every
source-of-truth folder has a home outside the web-root.
public/ was confusing because three source-of-truth folders lived ONLY inside it.
They now live in data/ (people-groups, vendor, external-bundles) and the build
copies them into the served tree (same pattern as boundaries), so served paths
are unchanged and public/ is fully regenerable. data/README.md states the law.
