feat(gateway): tx.get returns per-receipt outcomes (ENG-720)

[peer2f00l]

Closes ENG-720. Sub-issue of ENG-718.

tx.get exposed only the final return_value, flattened logs, and the set of failed_receipts, so a value an inner receipt returned — e.g. the MPC signature v1.signer returns inside a DAO act_proposal chain — was unreachable through the gateway.

Changes

• Additive receipts: Vec<ReceiptRecord { executor_id, status, return_value, logs }> on tx::GetResult, return_value honouring the request's encoding. Built per call from receipt_outcomes(); nothing persisted, no store migration. Existing fields unchanged (#[serde(default)] on the new one).
• mock-receiver fix: its #[near] parameters were underscore-prefixed, which is the JSON field name the generated wrapper deserializes, so every ft_on_transfer/mt_on_transfer panicked with missing field _sender_id and the token contract refunded in full — while the transaction still reported success and the FT/MT/token sandbox tests passed on the top-level status. Asserting on the new per-receipt field is what exposed it.
• ft_tests: asserts the receiver's inner receipt succeeded with return value "0" and failed_receipts is empty.

Verification

• just test-sandbox -p templar-gateway-service -E 'test(ft_tests) | test(mt_tests) | test(token_tests)' (the receiver now genuinely executes).
• just test-fast on catalog/spec/dispatch; cargo fmt --all --check; clippy -D warnings on the touched crates.

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📝 Summary

Summary

• Add receipts to tx::GetResult.
• Return each receipt’s executor ID, status, logs, and encoding-aware return value.
• Keep existing fields unchanged. Add no persistence or store migration.
• Rename underscore-prefixed mock-receiver callback parameters to prevent token transfer handler panics.
• Extend the FT transfer-call test to verify a successful inner receipt, return value "0", and no failed receipts.

Review focus

• Verify receipt ordering and status mapping.
• Verify return-value encoding for JSON and Base64 requests.
• Verify that receipt status and return values cannot expose incorrect or incomplete execution results.
• Verify that callback parameter names match the expected #[near] JSON schema.
• Review targeted sandbox tests, fast tests, formatting checks, and clippy results. Test results were not supplied.
• Current review finding counts were not supplied.

Walkthrough

Changes

Transaction receipt results

Layer / File(s)	Summary
Receipt result contract gateway/methods-spec/src/tx.rs	GetResult now contains ordered ReceiptRecord values with executor, status, optional return value, and logs.
Receipt outcome mapping gateway/methods-dispatch/src/tx_impl.rs	Transaction retrieval converts receipt outcomes into records. Successful values use JSON or Base64 encoding. Receipt IDs have no return value, and failed executions report failed status.
Receipt behavior validation mock/receiver/src/lib.rs, service/gateway/src/rpc/tests/ft_tests.rs	The FT transfer test verifies the receiver receipt and JSON return value. Mock callback parameter names now match JSON fields without changing callback results.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant RPCTest
  participant TransactionQuery
  participant ReceiptOutcome
  RPCTest->>TransactionQuery: request transaction result
  TransactionQuery->>ReceiptOutcome: read receipt outcomes
  ReceiptOutcome-->>TransactionQuery: status, executor, logs, and return value
  TransactionQuery-->>RPCTest: ordered receipts
  RPCTest->>RPCTest: verify success, JSON "0", and no failed receipts

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Merge Risk: ⚪ Minimal · up to 8673c

The receipt response behavior is mergeable; the remaining recommendation is non-blocking API modeling work.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/eng-720-gateway-txget-returns-per-receipt-outcomes

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👉 Steps to fix this

Actionable comments posted: 1

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Inline comments:
In `@gateway/methods-spec/src/tx.rs`:
- Line 72: Update ReceiptRecord’s receipt outcome representation around
ReceiptStatus so deserialization enforces that failed receipts cannot contain a
return_value, while successful receipts may contain an optional return value.
Prefer a domain outcome such as Failed or Succeeded { return_value:
Option<ReturnValue> }; if the flat RPC shape must remain, introduce a wire type
and validate conversions in both directions, rejecting invalid combinations.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between a9108a3 and 8673c24.

📒 Files selected for processing (4)

• gateway/methods-dispatch/src/tx_impl.rs
• gateway/methods-spec/src/tx.rs
• mock/receiver/src/lib.rs
• service/gateway/src/rpc/tests/ft_tests.rs

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