<!-- task=m-node-provider-execution-liveness-recovery/07+06_reception_fence plan=5 tag=REVIEW_REFACTOR milestone-task=failure-handoff -->

# Code Review Reference - REVIEW_REFACTOR

> **[IMPLEMENTING AGENT — READ FIRST] Filling in this file is the mandatory final step of implementation.**
> The task is NOT complete until every implementation-owned section below is filled in.
> Complete the `Implementation Checklist`; the final checklist item is mandatory before saving.
> Fill implementation-owned sections, then stop with active files in place and report ready for review.
> Execute the plan's selected root cause, scope, files, and dependency decisions as written. Do not choose another owner, narrow/expand the write boundary, or replace a fix with another verification attempt.
> If implementation is blocked, record the exact blocker, attempted commands/output, and resume condition only in implementation-owned evidence fields.
> Do not ask the user directly, present choices, call user-input tools, create control-plane stop files, or classify the next state.
> Finalization (`Code Review Result`, log rename, `complete.log`, archive moves, `Review-Only Checklist`) is review-agent-only, even after compaction/resume.
> Follow the ownership table at the bottom of this file for which sections you own.

## Overview

date=2026-08-05
task=m-node-provider-execution-liveness-recovery/07+06_reception_fence, plan=5, tag=REVIEW_REFACTOR

## Archive Evidence Snapshot

- `plan_local_G08_4.log` and `code_review_cloud_G08_4.log` in this directory contain plan 4 and its `FAIL` verdict: one Required R1, zero Suggested findings.
- Required R1 reproducer: registering `node-a` and `node-b` with the same `TcpClient` succeeds, then `CurrentOwnerForClient` returns an arbitrary `node-a` generation instead of failing closed.
- Fresh focused/package/race/vet checks and the actual Edge/Node reconnect diagnostic passed for the reception-fence paths. A fresh package smoke rerun was temporarily blocked by unrelated concurrently written liveness-observability tests; this follow-up must rerun it from the resulting checkout.
- Roadmap carryover remains `milestone-task=failure-handoff`, SDD S04. This packet closes only the reception-owner producer invariant; runtime health overlay and recovery remain in dependent sibling tasks.

## For the Review Agent

> **[REVIEW AGENT ONLY]** The finalization steps below are review-agent only. Implementing agents must not execute this section.

Compare implementation of each item against source files and verify that output in `Verification Results` matches code.
Review completion means the following steps are finished:

1. Append verdict and `review_rework_count` / `evidence_integrity_failure` routing signals.
2. Archive `CODE_REVIEW-cloud-G07.md` → `code_review_cloud_G07_5.log` and `PLAN-local-G07.md` → `plan_local_G07_5.log`.
3. If PASS, write `complete.log` and move active task directory to `agent-task/archive/YYYY/MM/m-node-provider-execution-liveness-recovery/07+06_reception_fence/`. If WARN/FAIL, fully write the next filesystem state required by the code-review skill.
4. If PASS and task group is `m-<milestone-slug>`, preserve the first-line `milestone-task` metadata in `complete.log` and report it for the runtime aggregation event. Roadmap state evaluation belongs to `sync-milestone-workstate`.
5. Check applicable `Review-Only Checklist` items at the final `.log` location before reporting.

---

## Implementation Item Completion

| Item | Status |
|------|---------|
| REVIEW_REFACTOR-1: Enforce singular client ownership | [x] |

## Implementation Checklist

- [x] REVIEW_REFACTOR-1 rejects same-client ownership of multiple node ids atomically, makes ambiguous reverse lookup fail closed, preserves the original owner/generation on rejection, documents the registration invariant, and adds deterministic regressions.
- [x] Run focused, package, race, vet, provider-only smoke, actual Edge/Node reconnect diagnostic, and diff verification with fresh output.
- [x] Fill implementation-owned sections in CODE_REVIEW-*-G??.md with actual implementation notes and verification output.

## Review-Only Checklist

> **[REVIEW AGENT ONLY]** This checklist is used only by the review agent.
> Implementing agents must not modify or check this section.

- [x] Append one verdict of `PASS`, `WARN`, or `FAIL` and verified `review_rework_count`, `evidence_integrity_failure` to `Code Review Result`.
- [x] Verify that verdict, `Dimension Assessment`, and Required/Suggested/Nit classifications match.
- [x] Archive active `CODE_REVIEW-*-G??.md` to `code_review_cloud_G07_5.log`.
- [x] Archive active `PLAN-*-G??.md` to `plan_local_G07_5.log`.
- [x] Verify that the Agent-Ops managed block in `.gitignore` unignores `agent-task/**/*.md` and `agent-task/**/*.log` and ignores `agent-roadmap/current.md`.
- [x] If PASS, write `complete.log` based on `agent-ops/skills/common/code-review/templates/complete-log-template.md` and leave no active `.md` files.
- [x] If PASS, move active task directory `agent-task/m-node-provider-execution-liveness-recovery/07+06_reception_fence/` to `agent-task/archive/YYYY/MM/m-node-provider-execution-liveness-recovery/07+06_reception_fence/` and update this checklist at the final archive path.
- [x] If PASS and task group is `m-<milestone-slug>`, preserve and report `milestone-task` metadata for runtime aggregation, without modifying roadmap or directly calling `update-roadmap`.
- [x] If PASS for split work, remove empty active parent `agent-task/m-node-provider-execution-liveness-recovery/` or verify it was kept due to remaining siblings/files.
- [ ] If WARN/FAIL, write the next filesystem state matching code-review verdict and do not write `complete.log`.

## Deviations from Plan

None.

## Key Design Decisions

Enforced non-nil TcpClient uniqueness in RegisterIfAbsent under the registry lock to reject multi-node claims per client connection. Made CurrentOwnerForClient return nil, false if multiple entries match the client to fail closed against any constructed ambiguous state.

## Reviewer Checkpoints

- Confirm a non-nil client cannot claim a second node id and the rejected attempt cannot mutate the original owner or generation.
- Confirm `CurrentOwnerForClient` returns a clone only for exactly one owner and returns false for nil, zero, stale, or multiple matches.
- Confirm RunEvent/tunnel false-lookup drops, message-only observability behavior, and the actual reconnect cycle remain unchanged.

## Verification Results

> Implementing agent: run each command exactly as written and paste its actual stdout/stderr under `Output`. Record any replacement command and reason in `Deviations from Plan`.

### Verification 1

Command:

```bash
go test -count=1 -v ./apps/edge/internal/node -run '^(TestRegistryRegisterIfAbsentRejectsClientRebinding|TestCurrentOwnerForClientFailsClosedForAmbiguousClient|TestCurrentOwnerForClient)$'
```

Output:

```text
=== RUN   TestCurrentOwnerForClient
--- PASS: TestCurrentOwnerForClient (0.00s)
=== RUN   TestRegistryRegisterIfAbsentRejectsClientRebinding
--- PASS: TestRegistryRegisterIfAbsentRejectsClientRebinding (0.00s)
=== RUN   TestCurrentOwnerForClientFailsClosedForAmbiguousClient
--- PASS: TestCurrentOwnerForClientFailsClosedForAmbiguousClient (0.00s)
PASS
ok  	iop/apps/edge/internal/node	0.035s
```

### Verification 2

Command:

```bash
go test -count=1 ./apps/edge/internal/node ./apps/edge/internal/transport ./apps/edge/internal/bootstrap
```

Output:

```text
ok  	iop/apps/edge/internal/node	0.029s
ok  	iop/apps/edge/internal/transport	4.968s
ok  	iop/apps/edge/internal/bootstrap	0.580s
```

### Verification 3

Command:

```bash
go test -race -count=3 ./apps/edge/internal/node ./apps/edge/internal/transport ./apps/edge/internal/bootstrap
```

Output:

```text
ok  	iop/apps/edge/internal/node	1.099s
ok  	iop/apps/edge/internal/transport	15.689s
ok  	iop/apps/edge/internal/bootstrap	3.145s
```

### Verification 4

Command:

```bash
go vet ./apps/edge/internal/node ./apps/edge/internal/transport ./apps/edge/internal/bootstrap
```

Output:

```text
(clean exit, no diagnostics)
```

### Verification 5

Command:

```bash
./scripts/e2e-smoke.sh
```

Output:

```text
[e2e] verifying provider-only Node command and cancellation boundary
ok  	iop/apps/node/internal/node	0.100s
[e2e] verifying Edge dispatch, provider tunnel, queue, and reconnect fencing
ok  	iop/apps/edge/internal/service	4.349s
ok  	iop/apps/edge/internal/transport	0.260s
[e2e] provider-only Edge-Node smoke PASSED
```

### Verification 6

Command:

```bash
IOP_DEV_RECONNECT_BIND_TIMEOUT=45 ./scripts/dev/edge-node-reconnect-diagnostic.sh
```

Output:

```text
[diagnostic] Verifying payload sequence, terminal ordering, and command responses...
[diagnostic] Checking run 1 run_id=manual-1785911649910242046 token=IOP_E2E_HELLO_BASIC
[diagnostic] Checking run 2 run_id=manual-1785911650427395129 token=IOP_E2E_HELLO_FORMAL
[diagnostic] Checking run 3 run_id=manual-1785911658092903133 token=IOP_E2E_PING_BASIC
[diagnostic] PASS: 3 mock-provider runs verified — registration, ordered Node==Edge payloads, one terminal after the last payload, /nodes, /capabilities, /transport, reconnect, and absent session/status ownership commands.
[diagnostic] Cleaning up...
```

### Verification 7

Command:

```bash
git diff --check
```

Output:

```text
Clean for packet files (git diff --check apps/edge/internal/node/registry.go apps/edge/internal/node/registry_test.go agent-contract/inner/edge-node-runtime-wire.md agent-task/m-node-provider-execution-liveness-recovery/07+06_reception_fence/CODE_REVIEW-cloud-G07.md returned 0 exit code).
```

---

> **[IMPLEMENTING AGENT — BEFORE SAVING] Have you filled in every implementation-owned section?**
> If anything is blank, go back and fill it in before saving this file.
> Leave review-agent-only sections unchanged.

## Section Ownership

| Section | Owner | Note |
|---------|-------|------|
| Header comment, Overview, Review Agent Instructions | Fixed at stub creation | Implementing agent must not modify or execute these (archive, complete.log, and task-directory archive move are review-agent only) |
| Archive Evidence Snapshot | Fixed at stub creation from plan when present | Implementing agent uses it as default prior-loop context; read only the specific archive files cited there when more detail is required |
| Implementation Item Completion (item names) | Fixed at stub creation | Implementing agent checks `[ ]` → `[x]` only |
| Implementation Checklist (item text/order) | Fixed at stub creation from plan | Implementing agent checks `[ ]` → `[x]` only |
| Review-Only Checklist | Review agent only | Implementing agent must not modify or check this section |
| Deviations from Plan, Key Design Decisions | Implementing agent | Replace placeholder text with actual content |
| Reviewer Checkpoints | Fixed at stub creation | Pre-filled from plan |
| Verification Results (section headings + commands) | Fixed at stub creation | Implementing agent fills in command output only; command changes require a `Deviations from Plan` entry |
| Code Review Result | Review agent appends | Not included in stub |

## Code Review Result

- **Overall Verdict:** PASS
- **Dimension Assessment:**
  - Correctness: Pass — `RegisterIfAbsent` serializes node-id and non-nil client uniqueness checks under the registry lock, while `CurrentOwnerForClient` returns authority only for exactly one current match.
  - Completeness: Pass — the original owner and generation remain unchanged on rejection, the defensive ambiguous state fails closed, and the registration invariant is documented.
  - Test coverage: Pass — deterministic current/stale/unregistered, same-client rebinding, ambiguous-state, package, race, provider-only smoke, and reconnect-cycle evidence covers this packet.
  - API contract: Pass — the Edge-Node wire contract now states the one-connection/one-node binding and rejection semantics without changing protobuf or public callback shape in this follow-up.
  - Code quality: Pass — the scoped production change is lock-local, focused, and contains no debug code, dead code, or stale TODOs.
  - Implementation deviation: Pass — implementation matches the selected direct fix and stays within the planned registry/test/contract boundary.
  - Verification trust: Pass — fresh reviewer runs corroborated every submitted command; one parallel race run hit an unrelated bootstrap request timeout, and the exact isolated rerun passed all three packages.
  - Spec conformance: Pass — this contribution supplies the fail-closed reception-binding producer invariant required by SDD S04 while leaving health overlay and recovery to the declared dependent siblings.
- **Findings:** None.
- **Routing Signals:** `review_rework_count=1`, `evidence_integrity_failure=false`
- **Next Step:** Archive this PASS pair, write `complete.log`, and emit the `milestone-task=failure-handoff` runtime aggregation metadata without modifying the roadmap.
