@test parsing already works under ww_ww (parseattrs lives in the shared lib/ww/parse/decl.ww, picked up by both Cstage and wwstage), so this is the test-side parity: 997 is 910 with `ww run` swapped for `ww_ww run`, exercising the selfhost driver+compiler+assembler+ linker end-to-end on the same attest_pass.ww fixture. Suite is now 22 tests.