descriptor: expose WalletPolicy template + key_info accessors#2

bg002h wants to merge 1 commit into

apoelstra:2026-04/followup-895apoelstra/rust-miniscript:2026-04/followup-895from

bg002h:feat/wallet-policy-template-accessorbg002h/rust-miniscript:feat/wallet-policy-template-accessorCopy head branch name to clipboard