Hojun-Cho
502b304841
build_one now invokes 6c_ww / 6a_ww / 6l_ww from $self_dir, not the C-built binaries that share the directory. After this change `ww_ww build foo.ww` touches no cstage code at runtime — the fresh-checkout cstage is still needed to bring the wwstage into existence, but day-to-day work runs on the ww toolchain end to end. The C `ww` driver in cmd/ww/ still drives the C 6c/6a/6l. Test 993 (which used to be trivial — both drivers invoked the same C tools) now meaningfully compares the cstage pipeline against the wwstage pipeline on hello + wwdump and confirms byte-identical exes. The .combined.ww files for 6a/6l/ww/wwdump and smoke are regenerated by the ww driver's `expand()` step; their diff is the lib/os dup2 wrapper and the cgen.ww port from the prior two commits, propagating into the bootstrap inputs.