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refactor(json): rewrite lex_hex_digits with char-range patterns

Replace the case-folding bit trick (`c & ~32`) plus bound check with
direct char-range match arms ('0'..='9', 'A'..='F', 'a'..='f'). The
validity check is now the pattern itself rather than a numeric range on
the folded value, the `(32).lnot()` magic constant is gone, and the
redundant `.to_int()` on char literals is dropped (they overload to Int
in the arithmetic context).

Pure refactor on top of the backtick fix (#3704): no behavior change,
and the regression tests merged with that fix still pass. The rewrite
also makes the backtick-as-hex-digit bug structurally impossible, since
there is no longer a folding step that can map '`' (0x60) onto '@'
(0x40).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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