feat(escrow_wip): EscrowDatum / EscrowRedeemer / EscrowValue codecs
⚠ WIP — UNAUDITED. Feature-gated behind `escrow_wip`; out of default builds.
Mirrors aiken validator at aiken-escrow/escrow/validators/escrow.ak (also
WIP). Spec at aiken-escrow/README.md.
Five-redeemer two-party agreement-with-veto escrow:
- Open → both sign Agree → Agreed{at} → Settle (after lock_period)
- Agreed → either party Veto → per-contributor refund
- Open → Refund (after open_deadline) → per-contributor refund
Datum: ProductIsData (Constr 0 [a, b, recipient, deadline, lock, state, deposits]).
EscrowState: enum Open | Agreed{at} encoded as Constr 0/1 (with payload).
EscrowDeposit: per-contributor (pkh, Value) entry, Constr 0.
EscrowValue: Plutus Map<PolicyId, Map<AssetName, Int>>; preserves on-chain
ordering for cbor-equality checks the validator does on continuing-output
deposits diff.
Tests: 10 codec roundtrips (Open/Agreed states, ada-only/multi-asset values,
deposit lookup by pkh, value-merge sum). All pass under
`cargo test -p aldabra-dao --features escrow_wip escrow::`.
Builders + MCP tools land in follow-up commits on this branch.
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