lib/strings+test: graduate trim/ltrim/rtrim to Hare rune... variadic
ltrim(input, exclude: rune) -> ltrim(input, trim: rune...) per
ref/hare/strings/trim.ha:11. rtrim mirrors via riter/prev per :32.
trim thin wrapper ltrim(rtrim(input, trim...), trim...) per :54.
Unblocked by #15 (5609d04) — multi-rune iter+match-prev composition
in non-leaf callees now produces byte-identical asm + correct runtime
on both stages.
Subset: 0-arg call (len(trim)==0) returns input unchanged. lib/bytes
whitespace-default future commit will graduate strings.trim's
whitespace... fast path.
ltrim_cases / rtrim_cases / trim_cases table-driven via parallel runes
+ inputs + argo/argn + want arrays + loop. Hare ref/hare/strings/trim.ha:75
vectors covered: bracket-pair, "mississippi" multi-rune, "yellowwooddoor"
multi-rune, Sentimentalized long form, plus 0-arg cases and 4-byte rune
"abacadabra"/"ahi" coverage. Bisect via signalled = 1100/1200/1300 + i.
make test 122/122; ww2==ww3==ww4 byte-id holds via 995_self_rebuild.
Hojun-Cho
c305b04cb5