- `tasks/todo.md`: B0.5 description updated (re2 hard dep, no fallback);
add a "Backend follow-ups (sprint 1+)" section with M1-M7 + N1-N6 from
the code-review verdict.
- `CHANGELOG.md`: backend skeleton bullets refreshed (no re fallback,
streaming blob store, audit + scope on CRUD, 56 unit tests); new
"Code-review remediation" subsection lists B1 / MA1-MA6 / N4 / N6 / M8
with one-line rationale each.
- `tests/integration/conftest.py`: leave `db.create_all()` in place but
add an inline TODO (N6) pointing at the Alembic switchover that will
exercise the F11 seed + audit-log role grants in CI.
