PSBT Skill Provides PSBT (Partially Signed Bitcoin Transaction) construction and signing operations on the Bitcoin L1. PSBTs enable multi-party signing workflows such as ordinals marketplace purchases where both buyer and seller must sign before broadcast. - estimate-fee — Read-only fee estimation for a PSBT given its structure. - sign — Sign one or more PSBT inputs with the active unlocked wallet (P2WPKH or Taproot keys). - broadcast — Finalize a fully signed PSBT and broadcast it to the Bitcoin network via mempool.space. Usage Subcommands estimate-fee Estimate the network fee in satoshis fo…