# Complete - m-stream-evidence-gate-core/09_decision_arbiter

## 완료 일시

2026-07-26

## 요약

Decision Arbiter의 action 검증, deterministic arbitration, priority snapshot, coordinator result 전파를 판정 완료 2회와 선행 대체 pair 1개를 거쳐 최종 PASS로 종결했다.

## 루프 이력

| Plan | Review | Verdict | 메모 |
|------|--------|---------|------|
| `plan_local_G06_0.log` | `code_review_cloud_G07_0.log` | 미판정(대체) | 승인된 SDD action 계약과 충돌한 최초 pair를 구현 전 대체했다. |
| `plan_local_G07_1.log` | `code_review_cloud_G07_1.log` | FAIL | replacement가 금지 intent를 수용한 결함과 S13 결정성·priority/result 전파 증거 누락을 확인했다. |
| `plan_local_G05_2.log` | `code_review_cloud_G05_2.log` | PASS | constructor/Validate 계약을 일치시키고 누락된 정상·경계 테스트 및 fresh 검증을 완료했다. |

## 구현/정리 내용

- `NewArbitrationResult`가 입력 intent와 replacement를 독립 복사한 뒤 action별 금지 필드를 원 입력 의미대로 검증하고 recover/replacement의 `ruleID`를 필수화했다.
- replacement/recover 충돌, priority 및 stable id tie-break, 입력 순열 결정성, terminal 우선순위와 observe-only 제외를 자동화했다.
- ready/non-ready effective priority snapshot과 `GateCoordinator.Evaluate`/`Submit`의 arbiter result 전파를 자동화했다.

## 최종 검증

- `gofmt -l packages/go/streamgate/decision_arbiter.go packages/go/streamgate/decision_arbiter_test.go packages/go/streamgate/evaluation_contract_test.go packages/go/streamgate/filter_registry_test.go packages/go/streamgate/parallel_evaluation_test.go` - PASS; 출력 없음.
- `go test -count=1 ./packages/go/streamgate -run 'Test(ArbitrationResult|DecisionArbiter|EpochFilter|EpochFilterOutcome|ResolvedFilter|GateCoordinator)'` - PASS; `ok iop/packages/go/streamgate 0.813s`.
- `go test -count=1 ./packages/go/streamgate` - PASS; `ok iop/packages/go/streamgate 0.822s`.
- `go test -race -count=1 ./packages/go/streamgate` - PASS; `ok iop/packages/go/streamgate 1.861s`.
- `make proto` - PASS; protobuf 생성 명령 exit 0, 생성물 drift 없음.
- `go test -count=1 ./apps/edge/internal/transport ./apps/node/internal/transport` - PASS; Edge `4.746s`, Node `5.563s`.
- `rg --sort path -n 'ArbitrationActionReplacement|NewArbitrationResult|Priority\\(\\)|Arbitrate\\(' packages/go/streamgate` - PASS; 184개 일치 항목을 확인했다.
- `git diff --check` - PASS; whitespace 오류 없음.

## 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:
  - `decision-arbiter`: PASS; evidence=`agent-task/archive/2026/07/m-stream-evidence-gate-core/09_decision_arbiter/plan_local_G05_2.log`, `agent-task/archive/2026/07/m-stream-evidence-gate-core/09_decision_arbiter/code_review_cloud_G05_2.log`; verification=`go test -count=1 ./packages/go/streamgate`, `go test -race -count=1 ./packages/go/streamgate`, `make proto`, `go test -count=1 ./apps/edge/internal/transport ./apps/node/internal/transport`
- Not completed task ids: 없음

## 잔여 Nit
