Flip the 4 business ORM models (ThreadMetaRow, RunRow, FeedbackRow,
RunEventRow) to ``workspace_id: Mapped[str]`` with ``nullable=False``.
PR5's alembic 0003 already enforces NOT NULL at the DB layer; this
aligns the ORM-driven ``create_all()`` path (dev / tests) with the same
invariant so a new install ends up at the post-0003 schema without
running alembic.
Test fallout absorbed:
- `tests/conftest.py` autouse seed now produces a fully consistent
pair: user row (default_workspace_id = test-workspace-autouse) plus
the workspace itself. The PR5 backfill script's "users without
default_workspace_id" query no longer picks the fixture up. Insert
order is user → workspace → UPDATE user, walking around the chicken-
and-egg FK between `workspaces.owner_id` and `users.default_workspace_id`.
- `tests/test_backfill_workspace_id.py` adds a file-scoped autouse
fixture that temporarily flips `column.nullable = True` for the four
business tables (production correctness comes from alembic 0003;
the script's own job is exactly to fill rows between 0002 and 0003
so its tests need that transient state to be representable). Its
`_init_engine` also deletes the autouse seed rows to match the
"fresh DB" model the tests assume.
- `test_thread_meta_workspace_filter::test_create_workspace_none_bypasses`
renamed to `test_create_workspace_none_rejected_by_orm` and asserts
the new IntegrityError on explicit None — write paths can no longer
bypass workspace scope.
- 5 `test_workspace_context` tests + the auth-middleware reset test
get `@pytest.mark.no_auto_workspace` so they keep testing the
unset-contextvar path.
- `test_workspace_repo::test_list_by_user_bypass_returns_all` switches
to membership assertions instead of strict equality since the
autouse fixture surfaces under `user_id=None`.
3214 passed, 30 skipped; the remaining 17 are the documented
pre-existing caplog ordering flakes (all pass in isolation).
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