Compare the completed snapshot after get/all queries so RETURNING and
prepared PRAGMA writes survive reloads and reopening. Export only after
the outer operation or transaction succeeds; unchanged read snapshots
still avoid disk writes. This adds one export/byte comparison per read
snapshot without relying on SQL parsing or private sql.js APIs.
Add 18 regression cases covering multi-row INSERT/UPDATE/DELETE RETURNING,
standalone and transactional get/all, no-row PRAGMA writes, and rollback.
The unfixed adapter fails 16 of these cases. Strengthen read-only checks.
Validation: 148 focused tests pass on WSL Node 22 and Windows Node 24;
the general state-store suite passes 20/20 on WSL and 19/20 on Windows,
where the existing file-symlink fixture is denied by Windows permissions.
Scoped adapter coverage is 90.13% lines, 82.73% branches, 100% functions.
ESLint, Unicode safety, and git diff --check pass.
Yann Roberto
f76c469fa7