Hojun-Cho
2b893b9353
Restore Hare's two-tier delegation: strlower/strupper alloc a buffer then delegate to strlower_buf/strupper_buf, which fold ASCII case into a caller-provided buffer. Too-small buffer returns nomem via the `let nm: nomem` value form. ref/hare/ascii/string.ha:21,43. Regen w6c/wwdump/smoke combined.ww — all three embed lib/ascii.