`create()` now accepts `workspace_id: str | None | _AutoSentinel = AUTO`
on both the SQL and in-memory implementations (and the abstract base).
AUTO resolves via `resolve_workspace_id()` from the workspace contextvar
that PR4 AuthMiddleware sets; explicit None bypasses for migration paths;
explicit str overrides the contextvar.
Test infrastructure:
- conftest gains an autouse `_auto_workspace_context` fixture mirroring
the existing user fixture. Opt-out via `@pytest.mark.no_auto_workspace`.
- A SQLAlchemy `after_create` listener on `Base.metadata` seeds the
matching `test-workspace-autouse` + `test-user-autouse` rows whenever
`init_engine` runs `create_all()`, so the FK from threads_meta to
workspaces resolves. Alembic migration tests bypass create_all and are
unaffected, keeping real FK constraints under test.
- `test_thread_meta_workspace_filter.py` covers the three AUTO / explicit
/ None paths.
3 new tests pass; 115 existing thread_meta/run/feedback/run_event/owner
tests stay green.
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