feat(charka): charka-bcd — aritmética decimal con semántica COBOL

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Cimiento numérico del transpilador. Picture parsea la cláusula
PICTURE (9, V, S, 9(n)); Decimal es punto fijo exacto (mantissa i128
+ scale) con suma/resta/producto exactos, división con escala de
resultado fija, redondeo Truncate/HalfUp y coerce a un Picture con
detección de desbordamiento (ON SIZE ERROR).

22 tests. Determinista, sin deps de plataforma — base de Fase D.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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sergio

2026-05-20 17:22:40 +00:00

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