Hojun-Cho 0197dfb9e6 lex,wwi: \u/\U unicode escapes + wide-rune .wwi round-trip, both stages (#50) ...

Hare-faithful \u (4 hex) / \U (8 hex) escapes; \x/\u/\U share one codepoint
path (ref/hare/hare/lex/lex.ha lex_unicode); string literals UTF-8-encode
multi-byte codepoints (cstage inline utf8enc, wwstage utf8.encoderune). The
.wwi producer rune serializer now emits \u/\U so exported wide-rune defs
round-trip (was a fatal >0xFF). Reject >0x10FFFF and surrogates with Hare-
verbatim error strings. Closes the int-cast spelling divergence (#48 RUNE_MAX).
Both stages byte-identical; 446 tests pass.

2026-06-18 22:47:53 +09:00

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