@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.
Hojun-Cho
22999cd3fa