Require redeemer equal to tx_id in mint validator

[Copilot]

The mint validator accepted but ignored its redeemer. This adds enforcement: the redeemer must equal the tx_id script parameter, and mint.ts supplies it accordingly.

Validator (validators/mint.ak)

• Replaced _redeemer with a typed redeemer: Hash<Blake2b_256, Transaction>
• Added redeemer == tx_id assertion gating the rest of the mint logic

mint(redeemer: Hash<Blake2b_256, Transaction>, policy: PolicyId, self: Transaction) {
  let reference = OutputReference { transaction_id: tx_id, output_index: index }
  let Transaction { inputs, mint, .. } = self
  redeemer == tx_id && mint_validator(policy, reference, inputs, mint)
}

Off-chain (src/mint.ts)

• Passes TransactionHash.toBytes(ref.transactionId) as the redeemer in mintAssets, providing the tx_id bytes expected by the validator

.mintAssets({
  assets: Assets.fromRecord({ [token]: amount }),
  redeemer: TransactionHash.toBytes(ref.transactionId),
})

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