<!-- task=m-iop-hot-path-one-shot-execution/09+06,08_artifact_pair plan=2 tag=REVIEW_API milestone-task=artifact-pair -->

# Complete - m-iop-hot-path-one-shot-execution/09+06,08_artifact_pair

## Completion Time

2026-08-03

## Summary

Completed the artifact-pair handler integration and direct-frontier lifecycle after three review loops; final verdict: PASS.

## Loop History

| Plan | Review | Verdict | Notes |
|------|--------|---------|-------|
| `plan_cloud_G08_0.log` | `code_review_cloud_G09_0.log` | FAIL | The pinned prepare/pair frontier, receipt validation, and deterministic S06 matrix were missing. |
| `plan_cloud_G09_1.log` | `code_review_cloud_G09_1.log` | FAIL | Artifact dispositions were not consumed by public handlers, pair-ready could downgrade to direct, and successful direct completion retained artifact state. |
| `plan_cloud_G08_2.log` | `code_review_cloud_G08_2.log` | PASS | Typed handler disposition, pair-only progression, endpoint-native local handoff, and direct terminal cleanup passed all required checks. |

## Implementation and Cleanup

- Returned a typed artifact disposition through Chat and Messages ingress and consumed it before provider-pool submission.
- Preserved the selector stage after prepare, blocked pair-ready direct downgrade, and handed exact pair success to a fail-closed local-stage boundary without starting a later-stage worker.
- Released both logical-request and artifact-frontier state after successful no-tool direct completion while preserving ordinary tool-waiting turns.
- Added public-route and lifecycle regressions for both protocol surfaces, selector call counts, endpoint-native handoff errors, replay safety, and bounded store reuse.

## Final Verification

- `test -f agent-task/m-iop-hot-path-one-shot-execution/06+04,05_request_identity_ingress/complete.log || test -f agent-task/archive/2026/08/m-iop-hot-path-one-shot-execution/06+04,05_request_identity_ingress/complete.log` - PASS; predecessor evidence exists.
- `test -f agent-task/m-iop-hot-path-one-shot-execution/08+02,04,06_workspace_binding/complete.log || test -f agent-task/archive/2026/08/m-iop-hot-path-one-shot-execution/08+02,04,06_workspace_binding/complete.log` - PASS; predecessor evidence exists.
- `go test ./apps/edge/internal/openai -list 'Test(ArtifactPairHandlerDisposition|DirectTurnReleasesArtifactFrontier)' | rg 'Test(ArtifactPairHandlerDisposition|DirectTurnReleasesArtifactFrontier)'` - PASS; both named regressions were listed.
- `go test -race -count=1 ./apps/edge/internal/openai -run 'Test(Workspace|ArtifactPair|DirectTurnReleasesArtifactFrontier)'` - PASS; `ok iop/apps/edge/internal/openai 1.497s`.
- `go test -race -count=1 ./packages/go/streamgate ./apps/edge/internal/openai ./apps/edge/internal/service` - PASS; all three packages passed with fresh uncached race results.
- `go vet ./apps/edge/internal/openai` - PASS; no output.
- `gofmt -d apps/edge/internal/openai/artifact_pair.go apps/edge/internal/openai/artifact_pair_test.go apps/edge/internal/openai/request_identity_ingress.go apps/edge/internal/openai/chat_handler.go apps/edge/internal/openai/anthropic_handler.go apps/edge/internal/openai/hot_path_dispatch.go apps/edge/internal/openai/hot_path_direct.go apps/edge/internal/openai/hot_path_direct_test.go` - PASS; no output.
- `git diff --check` - PASS; no output.

## Remaining Nits

- None.

## Follow-up Work

- None for this task. Local/review stage execution remains owned by later milestone children.
