Optimize PrepareDecoding#19
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Transition.cpp: remove 7 dead methods, closed-form matrix exponentials for SMC/SMC1, 3x3 block decomposition for CSC, binary search in findIntervalForTime. Simplify getOmegas and decoding quantity assembly. smcpp CSFS: add raw_sfs_batch() using double instead of adouble — the original raw_sfs computed autodiff derivatives then discarded them. Batch all 69 discretization intervals in one call instead of 69 separate calls. Output matches within machine epsilon (max abs 2e-15).
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Transition.cpp: remove 7 dead methods, closed-form matrix exponentials for SMC/SMC1, 3x3 block decomposition for CSC, binary search in findIntervalForTime. Simplify getOmegas and decoding quantity assembly.
smcpp CSFS: add raw_sfs_batch() using double instead of adouble — the original raw_sfs computed autodiff derivatives then discarded them. Batch all 69 discretization intervals in one call instead of 69 separate calls. Output matches within machine epsilon (max abs 2e-15).