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d9e001bee6
Restructure melt flow into a multi-step saga with compensation-based rollback. Remove ProofWriter in favor of explicit compensation actions for improved reliability and clarity in handling partial failures during melt operations. Breaks down monolithic change processing logic into smaller, focused methods: - process_change_outputs: orchestrates full change workflow - validate_change_outputs: checks for already-signed messages - calculate_change_fee_and_amounts: fetches keyset configuration - split_change_amount: splits change into denominations - prepare_blinded_messages_with_amounts: pairs amounts with blinded messages - store_change_signatures: handles TX2 database operations