`payment_escrow` — `DataKey::TreasuryAmount` is referenced in `resolve_dispute` and `withdraw_treasury` but not declared in the `DataKey` enum

[Nabeelahh]

• Area: Smart Contract
• Description: The file references DataKey::TreasuryAmount and calls Self::get_treasury_amount but neither the enum variant nor the helper function appear in the visible DataKey definition or contract body. This will cause a compile error. Add the missing variant and helper.
• File(s): contracts/payment_escrow/src/lib.rs, contracts/payment_escrow/src/test.rs
• Priority: High
• Implementation & verification: Treat this as a protocol-safety change: check authorization, storage/ABI compatibility, ledger-time behavior, and emitted events before changing the implementation. Add a contract-level regression test for both the invalid and successful paths.
• Work distribution: Implementation: contracts/payment_escrow/src/lib.rs. Integration: update the directly connected public interface only where required. Verification: contracts/payment_escrow/src/test.rs.

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