fix(regex): parse Perl horizontal whitespace natively - #1068
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Enable the Perl-only horizontal-whitespace syntax bit and teach the lexer to emit exact \h and \H semantics without changing Ruby's hex-digit escapes. Preserve the full Perl set under /a and /aa, including byte-mode classes. Add direct Joni and standard-Perl-validated product coverage for positive, complement, class, Unicode, byte, and scoped-modifier behavior. Generated with [Codex](https://openai.com/codex/) Co-Authored-By: Codex <codex@openai.com>
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Summary
\hand\Hparsing in the forked Joni syntaxh/Hbehavior/a//aaValidation
reg_posixcc.t: 2,560/2,560 on JVM and interpretermake: warning-free in 5m10, 17/17 tasks, exit 0Stack
This draft is stacked on
fix/phase36-joni-lookbehind-acceptance-v3at exactparent
6dc8f49f88d45f2c940baabdbedae6a4568309dc.References
dev/design/phase36-regex-parity.md.