Plutus V3 spend that consumes an Agreed escrow and refunds every
contributor to their enterprise (null-stake) address. Either party
can fire — validator gate is signed_by(a) || signed_by(b).
Off-chain reconstructs the validator's pkh_to_base_address via
ShelleyAddress::new(net, payment=key_hash(pkh), delegation=Null).
Below-floor deposits are topped up from the driver's funding utxo
to keep refund outputs submittable (validator's value_geq_flat
permits paying more than the deposit value).
7 tests: not-Agreed reject, outsider-driver reject, no-deposits
reject, two-contributor full refund happy path, below-floor topup,
either-party-drives, enterprise-addr construction is testnet for
preprod (sanity check on the network bit).
Kayos
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