dig-merkle 0.9.1

The DIG Network canonical CHIP-0035 DataLayer coin expert crate: a pure, key-free, network-free SpendBundle-builder for the Chia DataLayer singleton that anchors a .dig file's merkle root on-chain. Builds the exact CoinSpends for every DataLayer-coin lifecycle operation and reports the exact signatures a caller must produce — never holds a key, never signs, never broadcasts.