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d6f827c73d
Add `lotus-shed finality-calculator` subcommand that computes the probability a tipset gets replaced, based on FRC-0089. Reads chain history from a running node or text file and outputs a summary table with the shallowest depth achieving the 2^-30 safety target. Under healthy conditions (~5 blocks/epoch), probabilistic finality is typically reached within ~30 epochs (~15 min), compared to the static 900-epoch (~7.5 hr) EC finality assumption.