Replace raw f64 price/quantity in SmallBatchOptimizer with typed financial values. Conversion to f64 happens at the SIMD boundary (_mm256_loadu_pd) only. Delete 3 orphaned dead-code files: financial_safe.rs, simd_optimizations.rs, tests/financial_tests.rs. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>