Hojun-Cho
07fed80fab
Port ref/hare/ascii/string.ha strlower/strupper as the allocating entry points: byte-wise ASCII case fold, equivalent to Hare's rune fold since case-folding only touches bytes <0x80 and every UTF-8 multibyte byte is >=0x80 (passes through unchanged, length-preserving). nomem arises only from the allocation's `?`. strlower_buf/strupper_buf are deferred: ww has no nomem-value form or capacity-bounded static-append to express Hare's too-small-buffer path (#230); restore the two-tier delegation when those land. Divergence (rule 7): the empty-input fast path returns a nil/0 str because ww's alloc([], 0) routes through nomem, whereas Hare allocs a zero-length buffer and zero-loops; documented at the bypass site. Test vectors mirror Hare's @test (ABC/abc/[[[/こ/empty/aB1z). Adds lib/ascii/asciitest.ww + test/wcc/904_ascii_run.c (registered in the Makefile TESTS list and a build rule). Regenerates the ascii-embedding selfhost combined.ww amalgams (#110 freshness); the wwdump amalgam also reorders the ascii block after strings to satisfy the new import edge.