# Complete - m-stream-evidence-gate-core/03+01_event_contract_unit_tests

## 완료 일시

2026-07-24

## 요약

Stream Gate 불변성 테스트 직접 변조 증거 후속 — 3개 루프 결과: FAIL → FAIL → PASS. constructor input, accessor event, Append/Copy/FailureCauses 반환 chain의 `causes` element를 직접 변조하여 nested header storage와 bounded cause-chain 불변성을 recursive-copy 증거로 확보.

## 루프 이력

| Plan | Review | Verdict | 메모 |
|------|--------|---------|------|
| `plan_local_G04_0.log` | `code_review_local_G05_0.log` | FAIL | Required 3: response-start header validation 경로, event slice backing 공유 위험, cause chain element alias 미검증 |
| `plan_local_G05_1.log` | `code_review_local_G05_1.log` | FAIL | Required 2: EvidenceBatch response-start가 accessor copy만 변조, cause-chain이 버려지는 element 또는 All() copy만 변조 |
| `plan_local_G03_2.log` | `code_review_local_G05_2.log` | PASS | constructor input/accessor event nested header 직접 변조 + retained constructor input·Append·Copy·FailureCauses 반환 chain causes 직접 변조로 불변성 확보 |

## 구현/정리 내용

- `filter_contract_test.go` 마지막 sub-test를 `response_start_event_constructor_input_and_accessor_direct_mutation`으로 rename하고, `rsEvent.headers` 직접 변조 + `got[0].headers` 직접 변조를 추가하여 constructor input과 accessor event의 nested header storage 불변성을 직접 검증. 기존 `AsResponseStart().Headers()` copy-only 변조는 제거.
- `terminal_test.go`에서 4곳의 `All()` copy-only 변조를 `.causes[0]` 직접 변조로 교체: `constructor_input_mutation_isolation`(retained element도 변조), `append_returned_chain_mutation_isolation`, `Copy() element replacement`, `FailureCauses accessor element mutation`. 기존 public accessor(`All()`, `Headers()`) 반환 slice element mutation 검증은 별도 검증으로 유지.

## 최종 검증

- `GOTOOLCHAIN=go1.24.12 go test -count=1 ./packages/go/streamgate -run '^Test(EvidenceBatchDefensivelyCopiesInputsAndAccessors|FailureCauseChainCapsAtFour|TerminalResultValidation)$'` - PASS; `ok  iop/packages/go/streamgate  0.002s`
- `GOTOOLCHAIN=go1.24.12 go test -count=1 ./packages/go/streamgate` - PASS; `ok  iop/packages/go/streamgate  0.003s`
- `GOTOOLCHAIN=go1.24.12 go vet ./packages/go/streamgate` - PASS; stdout 없음
- `GOTOOLCHAIN=go1.24.12 go test -count=1 ./apps/edge/internal/transport ./apps/node/internal/transport` - PASS; 두 transport 모두 PASS
- `gofmt -d packages/go/streamgate/filter_contract_test.go packages/go/streamgate/terminal_test.go` - PASS; diff 없음
- `rg --sort path -n 'inputEvent\.headers|got\[0\]\.headers|\.causes\[0\]' packages/go/streamgate/filter_contract_test.go packages/go/streamgate/terminal_test.go` - PASS; 5개 직접 변조 assertion 라인 확인

## Roadmap Completion

- Milestone: `agent-roadmap/phase/knowledge-tool-optimization-extension/milestones/stream-evidence-gate-core.md`
- Milestone link: [Milestone 문서](agent-roadmap/phase/knowledge-tool-optimization-extension/milestones/stream-evidence-gate-core.md)
- Completed task ids:
  - `03+01_event_contract_unit_tests`: PASS; evidence=`plan_local_G03_2.log`, `code_review_local_G05_2.log`; verification=`GOTOOLCHAIN=go1.24.12 go test -count=1 ./packages/go/streamgate -run '^Test(EvidenceBatchDefensivelyCopiesInputsAndAccessors|FailureCauseChainCapsAtFour|TerminalResultValidation)$'` - PASS
- Not completed task ids: 없음

## 잔여 Nit

- 없음

## 후속 작업

- 없음
