Feat english braille rules#170
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…sh rule test suite
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Adds an opt-in Unified English Braille Grade-2 encoder, off by default so the stable Korean/Math pipeline is untouched (default build testcases unchanged at english 616 / korean 1527 / math 892). english_ueb (base feature): - §3 symbols, §6 numbers (incl. §6.3 numeric-mode continuation across digit separators), §7 punctuation, §8 capitals (§8.4 passages, §8.7 grade-1 shortform-collision guard) - §2.6 standing-alone (§2.6.2 leading-punctuation asymmetry) - §10.1-10.5 word/groupsigns, §10.7 initial-letter (rare-sequence safe subset only), §10.8 final-letter groupsigns (tion/ness/ment/ity/...) - §4.2 accented letters (lowercase): accent indicator + base letter - math-expression preflight (is_math_owned) so the math engine keeps ownership of sin/3ab/f(x-1)/log2/... english_ueb_cmudict (optional feature, bundles CMUdict, Simplified BSD): - §10.6 restricted be/con lower groupsigns via a pronunciation-based syllable-boundary classifier (become vs beckon, benefit vs beneficent) - conservative: spells out on any ambiguity, never guesses english testcases: 616 -> 1074 (base) / 1099 (cmudict). Pronunciation/morphology-dependent contractions (risky §10.7 set, §10.11 bridging) intentionally deferred rather than mis-generalized.
Adds the dollar sign as a UEB §3.10 currency sign (\$ -> ⠈⠎). A balanced \$...\$ LaTeX math span is kept with the math engine via is_math_owned, so only a lone/trailing \$ (currency: US\$, A\, \) reaches the English path. english testcases +4 (base 1074 -> 1078); korean/math and the default build unchanged. Bare currency-only inputs (\, \) stay with the legacy path: a lone currency symbol is language-context ambiguous (Korean §65 wants the ⠴ prefix), so routing it to UEB is deferred to an explicit-mode pass.
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