This is the same suite that gates every commit, running here instead of in CI. It opens a
real SQLite database in OPFS, exercises indexes, transactions and multi-tab coordination,
and proves the whole thing works with no COOP/COEP headers.
Roughly 25 checks, a few seconds. Everything happens locally in this tab — nothing is
uploaded. The suite uses its own playground database and deletes it at the
end, so no other site's data is touched.
opfs-sahpool, falling back to IndexedDB, then memory.
crossOriginIsolated === false.