[DeepDev69x3]

Summary

This PR resolves #2025 by introducing a canonical, committed JSON ABI fixture (contracts/shared/payment_escrow.abi.json), synchronizing the TypeScript ContractError table with all contract error codes, adding automated ABI conformance tests in both Rust and the backend client, and validating parameter signatures.

Closes #2025

Key Changes

1. Canonical Interface & ABI Fixture (contracts/shared/payment_escrow.abi.json & backend fixture):

   • Defines the canonical Soroban contract specification for payment_escrow (version 1).
   • Specifies all public functions (create, release, refund, release_partial, refund_remaining, get_status, get_escrow, initialize, version, upgrade, propose_admin, accept_admin, pause, unpause, is_paused) along with their input parameter names, types, and return types.
   • Formally enumerates all contract errors and lifecycle states.

2. TypeScript Error Enum & Table Synchronization (contracts/shared/error-codes.ts & escrow-contract.client.ts):

   • Extended ContractError enum to cover all 14 contract error codes (including AlreadyReleased = 6, AlreadyRefunded = 7, AlreadyInitialized = 10, NotInitialized = 11, Unauthorized = 12, Paused = 13, NoPendingAdmin = 14, AmountExceedsEscrow = 20, NothingToRefund = 21).
   • Aligned CONTRACT_ERROR_NAMES table for reliable client-side and backend mapping.
   • Updated buildCreateTx to optionally accept the 5th tokenAddress argument while retaining backward compatibility.

3. Backend Client ABI Conformance Suite (backend/src/payments/soroban/abi-fixture.spec.ts):

   • Added comprehensive unit tests verifying that EscrowContractClient transaction builders (buildCreateTx, buildReleaseTx, buildRefundTx) generate invocations matching the fixture functions and argument counts.
   • Asserts 100% synchronization between the TypeScript ContractError enum and the contract ABI fixture.

4. Rust Contract ABI Synchronization Test (contracts/payment_escrow/tests/abi_fixture_test.rs):

   • Added integration tests in Rust asserting that the contract's VERSION, Error enum variant codes, and EscrowState values match the shared fixture.

Verification & CI Proof

• cargo test --workspace: 32/32 tests passing (100% green).
• cargo clippy --workspace --all-targets -- -D warnings: 0 warnings / 0 errors.
• cargo fmt --all -- --check: Passed.
• bash scripts/audit_require_auth.sh: All entrypoints passed auth check.
• npm test -- src/payments/soroban/: 10 test suites passed (86 tests passing, 0 errors).
• npm run lint & npm run build: 0 lint errors, build succeeded cleanly.

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