feat(bfloat16): add ArithmeticMode support and NaN propagation#8
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Implement BFloat16AddWithMode, SubWithMode, MulWithMode, DivWithMode with ArithmeticMode parameter (IEEE, Fast, Exact). Add proper NaN propagation across all operations and gradual underflow for subnormal results. Include BFloat16FMA using float64 intermediate precision.
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T46.5.1: BFloat16 Phase 2 - WithMode arithmetic functions, NaN propagation, gradual underflow, FMA.