<!-- task=m-iop-owned-single-request-agent-execution/03+02_single_request_coordinator plan=5 tag=REVIEW_REVIEW_API milestone-task=single-ingress -->

# Complete - m-iop-owned-single-request-agent-execution/03+02_single_request_coordinator

## Completion Date

2026-08-06

## Summary

Completed the surface-neutral single-request coordinator final-candidate handoff after six plan snapshots and three verdict-bearing review loops; final verdict PASS.

## Loop History

| Plan | Review | Verdict | Notes |
|------|--------|---------|-------|
| `plan_cloud_G09_0.log` | `code_review_cloud_G10_0.log` | Not reviewed | Initial parent pair was superseded during plan refinement before implementation evidence or a verdict. |
| `plan_cloud_G09_1.log` | `code_review_cloud_G10_1.log` | Not reviewed | Refined parent pair was superseded before implementation evidence or a verdict. |
| `plan_cloud_G09_2.log` | `code_review_cloud_G10_2.log` | Not reviewed | Parent work was split into the indexed coordinator packet before implementation evidence or a verdict. |
| `plan_local_G07_3.log` | `code_review_cloud_G08_3.log` | FAIL | Required R1-R5 identified acknowledgement bypass, early-return hangs, mutable ownership, unordered envelopes, and unsafe progress delivery. |
| `plan_cloud_G08_4.log` | `code_review_cloud_G08_4.log` | FAIL | R2-R4 closed, while R1 and R5 still required exact final-candidate validation and pre-acknowledgement surface delivery. |
| `plan_cloud_G08_5.log` | `code_review_cloud_G08_5.log` | PASS | Finalizing candidate validation, immutable surface delivery, acknowledgement defense, and focused regressions closed the remaining findings. |

## Implementation and Cleanup

- Restricted result payloads to a non-nil `finalizing` envelope and retained a defensive coordinator-owned copy.
- Added a successful-acknowledgement guard that fails closed when no retained final candidate exists.
- Published a separate final-candidate clone only on the reserved finalizing progress event while keeping other progress payloads redacted.
- Added deterministic nil/stale candidate, acknowledgement, saturation, redaction, and copy-isolation regressions while preserving the earlier lifecycle and terminal-race coverage.

## Final Verification

- `test -f agent-task/m-iop-owned-single-request-agent-execution/02+01_preset_binding/complete.log || test "$(compgen -G 'agent-task/archive/*/*/m-iop-owned-single-request-agent-execution/02+01_preset_binding/complete.log' | wc -l)" -eq 1` - PASS; the unique predecessor completion evidence was found.
- `test -z "$(gofmt -l apps/edge/internal/service/single_request.go apps/edge/internal/service/single_request_test.go)"` - PASS; no unformatted path was reported.
- `go test -race ./apps/edge/internal/service -run 'TestSingleRequest' -count=1` - PASS; `ok iop/apps/edge/internal/service 1.170s`.
- `go test ./apps/edge/internal/service -count=1` - PASS; `ok iop/apps/edge/internal/service 6.000s`.
- `go vet ./apps/edge/...` - PASS; no diagnostics.
- `go test ./apps/edge/... -count=1` - PASS; every Edge package passed without cached results.
- `git diff --check` - PASS; no whitespace errors.

## Remaining Nits

- None.

## Follow-up Work

- None within this task. The existing HTTP admission packet retains ownership of ingress counting, endpoint tests, and outer/input documentation.
