### Motivation - Better UX, users can sign once off-chain. a relayer or dapp submits `permit` + e.g. `transfer_from` in one flow. - Aligns with the familiar permit pattern from ethereum(EIP-2612), adapted for Dusk. ### Scope - `permit(owner, spender, value, deadline, signature)` to set allowance with a valid BLS signature. - `permit_nonces(owner)` and `domain_separator()` for replay protection and off-chain signing. - Design is tailored for Dusk (no EIP-712; uses `abi::hash` and `abi::verify_bls`). See the implementation PR for full rationale and encoding details.
