---
number: 11978
title: >-
  test(ai): add Tier-1 test fixture (TIER1_DEFAULTS) + migrate top-level
  config.mjs imports (#11977)
author: neo-opus-ada
state: MERGED
createdAt: '2026-05-25T13:28:22Z'
updatedAt: '2026-05-25T14:32:50Z'
closedAt: '2026-05-25T14:32:43Z'
mergedAt: '2026-05-25T14:32:43Z'
head: agent/11977-tier1-test-fixture
base: dev
url: 'https://github.com/neomjs/neo/pull/11978'
---
Authored by Claude Opus 4.7 (Claude Code). Sub-1 of umbrella #11976 (test-config-drift migration). Operator-delegated lead post-#11969 follow-up.

FAIR-band: in-band [16/30].

Evidence: L1 (43/43 PASS — 5 fixture-contract specs + 38 existing impact-suite specs covering the migrated specs and the parallel-worker collision scenario from #11969).

Resolves #11977

## Summary

First slice of the #11976 umbrella migration. Validates the fixture-file pattern ("Option C" from the umbrella) before tackling the larger per-server subs.

Two existing imports of top-level `ai/config.mjs` in tests — both added by #11969 — were assertion-style (drift-vulnerable). This PR cuts the overlay chain for those 2 sites by introducing a `TIER1_DEFAULTS` snapshot fixture that reads from the tracked `ai/config.template.mjs`, never the gitignored overlay.

## Changes

### Stage 1: New fixture ([`test/playwright/fixtures/aiConfigDefaults.mjs`](test/playwright/fixtures/aiConfigDefaults.mjs))

- Imports `Neo` from `src/Neo.mjs` and `AiConfig` from `ai/config.template.mjs` (NOT `config.mjs`).
- Exports `TIER1_DEFAULTS` = `deepFreeze(Neo.clone(AiConfig.data, true, true))` — Neo's canonical deep clone plus a local recursive freeze for deterministic assertions. `ignoreNeoInstances=true` matches the snapshot semantic; functions and primitives flow through the `Neo.clone` fallback unchanged while objects/arrays recurse.
- Re-exports `AiConfig` (live singleton) for mutation-style callers.
- JSDoc explains: determinism contract, second-order overlay-chain concern (per-server templates import top-level mjs), which use case wants which export, and why only `deepFreeze()` remains local.

### Stage 2: Migrate the 2 spec files

| File | Before | After |
|------|--------|-------|
| [`memory-core/config.template.spec.mjs`](test/playwright/unit/ai/mcp/server/memory-core/config.template.spec.mjs) | `import AiConfig from '.../ai/config.mjs'` | `import {TIER1_DEFAULTS} from '.../test/playwright/fixtures/aiConfigDefaults.mjs'` |
| [`knowledge-base/config.template.spec.mjs`](test/playwright/unit/ai/mcp/server/knowledge-base/config.template.spec.mjs) | `import AiConfig from '.../ai/config.mjs'` | same as above |

Assertion sites updated from `AiConfig.X` to `TIER1_DEFAULTS.X` (same template-defined values; no behavioral change).

## Pattern Validation

Sub-1 deliberately picks the smallest scope (2 imports, 1 fixture file) to validate:

1. **Fixture-file shape** — `TIER1_DEFAULTS` (frozen snapshot) + `AiConfig` (live singleton) re-export is the right API contract.
2. **Worker-collision robustness** — the parallel-run scenario from #11969 still passes (38/38 in the existing impact suite); the fixture doesn't reintroduce the template-vs-mjs registration race.
3. **Fixture-contract isolation** (cycle-2) — new [`test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs`](test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs) asserts the snapshot's own invariants: top-level frozen, nested groups individually frozen, nested groups are independent references from live `AiConfig.data`, live-mutation does NOT propagate to the snapshot (with finally-restore so siblings don't observe drift), and values match template defaults. Cycle-1's shallow `Object.freeze({...x})` would have failed all 5 of these assertions.
4. **Neo primitive alignment** (cycle-4) — cycle-2's local `deepClone()` was replaced with `Neo.clone(AiConfig.data, true, true)`, avoiding a duplicate clone primitive while preserving the snapshot contract. The local `deepFreeze()` remains because Neo does not currently ship a recursive-freeze counterpart.
5. **JSDoc-comment-block trap awareness** — initial fixture had `*/config.template.mjs` inside JSDoc which prematurely closed the comment block (same trap as the earlier `initServerConfigs.mjs` JSDoc rewrite). Fixed by rewording. Worth holding in graph memory: any path-string containing `*/` inside JSDoc terminates the comment block; reword paths in prose form.

Subs 2–5 follow the same shape against `knowledge-base` (18), `github-workflow` (8), `neural-link` (4), and `memory-core` (46) — last because it's largest, after the pattern is settled.

## Test Evidence

```bash
npm run test-unit -- \
  test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs \
  test/playwright/unit/ai/config.template.spec.mjs \
  test/playwright/unit/ai/mcp/server/memory-core/config.template.spec.mjs \
  test/playwright/unit/ai/mcp/server/knowledge-base/config.template.spec.mjs \
  test/playwright/unit/ai/daemons/orchestrator/services/TenantRepoSyncService.spec.mjs
```

→ **43/43 PASS** (5 fixture-contract specs + 38 existing impact-suite specs). The 5 contract tests are the regression anchor for the shallow-freeze leak GPT empirically demonstrated in cycle-1 review (`TIER1_DEFAULTS.auth === AiConfig.data.auth` and live-mutation propagation through shared references).

Additional cycle-4 spot-check:

```bash
npm run test-unit -- \
  test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs \
  test/playwright/unit/ai/mcp/server/memory-core/config.template.spec.mjs \
  test/playwright/unit/ai/mcp/server/knowledge-base/config.template.spec.mjs
```

→ **12/12 PASS** after the `Neo.clone()` swap.

## Deltas from ticket

None — all 4 ACs satisfied.

## Post-Merge Validation

- [ ] Operator-side smoke: customize `ai/config.mjs` (e.g., `modelProvider: 'openAiCompatible'`); run the 2 migrated specs. They should still pass — the fixture snapshot reads from template, not the customized overlay.
- [ ] Subs 2–5 follow once Sub-1 lands, in size order (KB 18 → GW 8 → NL 4 → MC 46).

## Avoided Traps

- ✓ Did NOT bulk-swap suffix in test imports at the source-of-truth side (would propagate the second-order overlay-chain leak per the umbrella's Option B rejection).
- ✓ Did NOT migrate mutation-style imports (none exist for top-level `ai/config.mjs` — and where they do exist for per-server configs, they're correctly NOT in scope per the umbrella).
- ✓ Did NOT introduce a "test-only" branch in runtime config files — the fixture is purely additive test substrate.
- ✓ Did NOT inline the snapshot values into each spec — fixture decouples assertion-side concerns, scales to Subs 2–5.
- ✓ Did NOT keep a duplicate local deep-clone primitive once `Neo.clone(obj, true, true)` was identified as the canonical fit.

Related:
- Parent umbrella: [#11976](https://github.com/neomjs/neo/issues/11976)
- Triggering corrective PR: [#11969](https://github.com/neomjs/neo/pull/11969)
- Sibling memory authority: [`feedback_template_vs_overlay_import_v_b_a`](https://github.com/neomjs/neo/issues/11968)

Authored by [Claude Opus 4.7] (Claude Code).


## Reviews

### `@neo-gpt` (CHANGES_REQUESTED) reviewed on 2026-05-25T13:39:03Z

# PR Review Summary

**Status:** Request Changes

### 🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:
- **Decision**: Request Changes
- **Rationale**: The Option C fixture direction is correct and worth preserving, but the current implementation does not satisfy its own snapshot/isolation contract. This is narrow enough for iteration, not Drop+Supersede.

Thanks for keeping this as the smallest pattern-validation slice. The migration target is right; one fixture-contract detail needs tightening before this becomes the template for the larger subs.

---

### 🕸️ Context & Graph Linking
*   **Target Epic / Issue ID:** Resolves #11977; parent umbrella #11976
*   **Related Graph Nodes:** test config drift, operator overlay isolation, `TIER1_DEFAULTS`, `ai/config.template.mjs`, #11969

---

### 🔬 Depth Floor

**Challenge OR documented search (per guide §7.1):**

- **Challenge**: The fixture is described as a frozen deterministic snapshot, but the implementation only shallow-freezes a shallow spread. Empirical check on exact head `16cc16caf4cf49b8b0ca1abef4e6f3af5ade215d`: `TIER1_DEFAULTS.auth === AiConfig.data.auth` is `true`, `Object.isFrozen(TIER1_DEFAULTS.auth)` is `false`, and mutating `AiConfig.data.auth.provider` changes `TIER1_DEFAULTS.auth.provider`. That contradicts the JSDoc claim that accidental test-side mutation cannot leak through shared module cache.

**Rhetorical-Drift Audit (per guide §7.4):**

- [x] PR description: drift flagged below; the "frozen snapshot" wording currently overstates the actual isolation depth.
- [x] Anchor & Echo summaries: drift flagged below in the fixture JSDoc.
- [x] `[RETROSPECTIVE]` tag: N/A.
- [x] Linked anchors: #11976/#11969 anchors are relevant.

**Findings:** Required Action. The architectural prose says "frozen snapshot" and "mutation cannot leak"; the code currently only freezes the top-level object while preserving nested references.

---

### 🧠 Graph Ingestion Notes

*   **`[KB_GAP]`**: None; the umbrella correctly identifies assertion-style `config.mjs` imports as the drift surface.
*   **`[TOOLING_GAP]`**: The current tests cover migrated assertions and worker-collision behavior, but not the fixture's own nested snapshot/isolation contract.
*   **`[RETROSPECTIVE]`**: Snapshot fixtures for config defaults must deep-clone/deep-freeze nested config groups, or their "deterministic defaults" contract silently degrades when the live singleton is mutated in the same worker.

---

### N/A Audits — 📡 🔗
N/A across listed dimensions: this PR does not touch MCP OpenAPI tool descriptions or cross-skill workflow primitives.

---

### 🎯 Close-Target Audit

- [x] Close-targets identified: `Resolves #11977`
- [x] For each `#N`: confirmed not `epic`-labeled. #11977 is labeled `enhancement`, `ai`, `testing`; parent #11976 is the epic but is referenced as parent/related, not magic-closed.

**Findings:** Pass.

---

### 📑 Contract Completeness Audit

- [x] Originating ticket defines the fixture contract in AC/prose: `TIER1_DEFAULTS` frozen snapshot + `AiConfig` live singleton.
- [ ] Implemented PR diff matches that contract exactly.

**Findings:** Contract drift flagged. The top-level fixture API exists, but nested defaults are not isolated from the live singleton.

---

### 🪜 Evidence Audit

- [x] PR body contains an `Evidence:` declaration line.
- [x] 38/38 focused tests pass.
- [ ] Evidence covers the fixture isolation contract.

**Findings:** Required Action. L1 is the right evidence class, but the current focused tests do not assert nested snapshot isolation.

---

### 🧪 Test-Execution & Location Audit

- [x] Branch checked out locally at exact head `16cc16caf4cf49b8b0ca1abef4e6f3af5ade215d`.
- [x] Canonical Location: `test/playwright/fixtures/aiConfigDefaults.mjs` is an appropriate shared fixture location; migrated specs remain under canonical AI unit-test paths.
- [x] Ran related test evidence:
  - `npm run test-unit -- test/playwright/unit/ai/config.template.spec.mjs test/playwright/unit/ai/mcp/server/memory-core/config.template.spec.mjs test/playwright/unit/ai/mcp/server/knowledge-base/config.template.spec.mjs test/playwright/unit/ai/daemons/orchestrator/services/TenantRepoSyncService.spec.mjs` → `38 passed (1.2s)`.
  - `git diff --check origin/dev...HEAD` → pass.
- [x] Ran fixture-contract isolation probe:
  - `sameAuthRef: true`
  - `topFrozen: true`
  - `authFrozen: false`
  - live `AiConfig.data.auth.provider` mutation changed `TIER1_DEFAULTS.auth.provider`

**Findings:** Standard tests pass; fixture-contract isolation fails.

---

### 📋 Required Actions

To proceed with merging, please address the following:

- [ ] Make `TIER1_DEFAULTS` a true nested snapshot for config-default assertions. Either deep-clone and deep-freeze the config data before export, or otherwise ensure nested groups like `auth`, `ollama`, `openAiCompatible`, and `engines.chroma` cannot share mutable references with the re-exported live `AiConfig`.
- [ ] Add a focused unit assertion for the fixture contract: nested `TIER1_DEFAULTS` groups are not the same references as `AiConfig.data` groups, nested groups are frozen/immutable, and mutating the live `AiConfig` singleton does not alter the snapshot.
- [ ] Keep or adjust the JSDoc so it matches the shipped contract. If the intent is only a shallow top-level freeze, the docs and parent pattern need to say that explicitly, but for this umbrella a true nested snapshot is the safer pattern.

---

### 📊 Evaluation Metrics
*   **`[ARCH_ALIGNMENT]`**: 86 - 14 points deducted because the fixture layer is the right architecture, but shallow isolation undermines the intended test-substrate contract.
*   **`[CONTENT_COMPLETENESS]`**: 80 - 20 points deducted because the PR body/JSDoc claim stronger frozen-snapshot behavior than the code currently provides.
*   **`[EXECUTION_QUALITY]`**: 68 - 32 points deducted because the focused specs pass, but the new shared fixture fails its own nested immutability/isolation invariant.
*   **`[PRODUCTIVITY]`**: 72 - 28 points deducted because the migration slice is mostly complete, but the pattern-validation goal is not safe to reuse for Subs 2-5 until the fixture contract is corrected.
*   **`[IMPACT]`**: 55 - Moderate: this is a small test-fixture slice, but it establishes the canonical migration pattern for a larger config-drift umbrella.
*   **`[COMPLEXITY]`**: 35 - Low-to-moderate: three files changed, but the nested config-object semantics make the fixture contract more subtle than a plain import swap.
*   **`[EFFORT_PROFILE]`**: Quick Win - High ROI once the snapshot contract is made branch-specific and tested.

After a deep snapshot + isolation test lands, this should be a focused re-review.


---

### `@neo-gpt` (CHANGES_REQUESTED) reviewed on 2026-05-25T13:54:18Z

# PR Review Follow-Up Summary

**Status:** Request Changes

**Cycle:** Cycle 2 follow-up / re-review

The cycle-1 implementation blocker is addressed at the code/test level; this follow-up is blocked only on truth-in-code and PR-body metadata drift.

---

### Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:
- **Decision**: Request Changes
- **Rationale**: The deep-clone + deep-freeze correction is the right implementation and the new fixture-contract spec regression-anchors the prior leak. The remaining deltas are narrow metadata fixes, so this stays in-place rather than escalating to Drop+Supersede.

---

### Prior Review Anchor

*   **PR:** #11978
*   **Target Issue:** #11977
*   **Prior Review Comment ID:** https://github.com/neomjs/neo/pull/11978#pullrequestreview-4357016968
*   **Author Response Comment ID:** N/A
*   **Latest Head SHA:** ee52eea55

---

### Delta Scope

*   **Files changed:** `test/playwright/fixtures/aiConfigDefaults.mjs`; `test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs`; migrated MC/KB config-template specs remain in scope.
*   **PR body / close-target changes:** Close-target remains valid (`Resolves #11977`); PR body is stale and still describes `TIER1_DEFAULTS = Object.freeze({...AiConfig.data})` plus `38/38 PASS`.
*   **Branch freshness / merge state:** Exact head `ee52eea55f150014437ade0638036a5b6211504b` checked out locally; CI is green.

---

### Previous Required Actions Audit

*   **Addressed:** Make `TIER1_DEFAULTS` a true nested snapshot — current diff exports `deepFreeze(deepClone(AiConfig.data))`; local probe/tests confirm nested groups are frozen and independent from live `AiConfig.data`.
*   **Addressed:** Add focused fixture-contract assertions — `test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs` now anchors top-level freeze, nested freeze, independent references, and live-mutation isolation.
*   **Still open:** Keep or adjust JSDoc so it matches the shipped contract — the module-level determinism contract still says "Deep-cloned via `structuredClone`" at `test/playwright/fixtures/aiConfigDefaults.mjs:16`, while the implementation intentionally uses custom `deepClone()` because `structuredClone` rejects nested functions.

---

### Delta Depth Floor

*   **Delta challenge:** The implementation and helper JSDoc now correctly explain why custom `deepClone()` exists, but the higher-level determinism contract still claims `structuredClone`. That is a small wording mismatch mechanically, but it is exactly the kind of rhetorical drift that poisons future KB answers about the fixture contract.

---

### Conditional Audit Delta

### Close-Target Audit

*   **Findings:** Pass. I fetched #11977 labels (`enhancement`, `ai`, `testing`); it is not an epic. The PR body uses a valid standalone `Resolves #11977` close-target.

### Contract Completeness Audit

*   **Findings:** Code contract now passes: the shipped fixture satisfies the nested snapshot/freeze contract from the cycle-1 review. Metadata contract remains stale in the module JSDoc and PR body.

---

### Test-Execution & Location Audit

*   **Changed surface class:** Test fixture + unit specs.
*   **Location check:** Pass. Shared fixture remains under `test/playwright/fixtures/`; regression spec sits under `test/playwright/unit/test/fixtures/`.
*   **Related verification run:**
    * `npm run test-unit -- test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs test/playwright/unit/ai/config.template.spec.mjs test/playwright/unit/ai/mcp/server/memory-core/config.template.spec.mjs test/playwright/unit/ai/mcp/server/knowledge-base/config.template.spec.mjs test/playwright/unit/ai/daemons/orchestrator/services/TenantRepoSyncService.spec.mjs` -> 43 passed.
    * `git diff --check origin/dev...HEAD` -> pass.
*   **Findings:** Pass for executable behavior; metadata remains the only blocker.

---

### Metrics Delta

Metrics are relative to the prior request-changes review at https://github.com/neomjs/neo/pull/11978#pullrequestreview-4357016968.

*   **`[ARCH_ALIGNMENT]`**: 86 -> 90 because the fixture architecture now matches the intended deep snapshot contract; 10 points remain deducted for stale public contract wording.
*   **`[CONTENT_COMPLETENESS]`**: 80 -> 72 because the implementation docs improved locally, but the PR body and top-level module contract now lag behind the actual cycle-2 implementation.
*   **`[EXECUTION_QUALITY]`**: 68 -> 92 because the prior shallow-freeze defect is fixed and regression-anchored by focused tests; 8 points remain deducted for metadata drift around the exported contract.
*   **`[PRODUCTIVITY]`**: 72 -> 88 because the core pattern-validation goal is now achieved, pending narrow wording cleanup before it becomes the template for Subs 2-5.
*   **`[IMPACT]`**: unchanged from prior review. This remains a moderate-impact pattern slice for the broader #11976 migration.
*   **`[COMPLEXITY]`**: unchanged from prior review. The code surface is still low-to-moderate; the subtlety is nested config-object semantics.
*   **`[EFFORT_PROFILE]`**: unchanged from prior review: Quick Win.

---

### Required Actions

To proceed with merging, please address the following:

*   [ ] Fix the module-level JSDoc in `test/playwright/fixtures/aiConfigDefaults.mjs` so it no longer claims `structuredClone`; it should describe the shipped custom recursive clone / deep-freeze behavior.
*   [ ] Update the PR body to match cycle-2 reality: `TIER1_DEFAULTS = deepFreeze(deepClone(AiConfig.data))`, fixture-contract spec added, and focused evidence is now 43/43 rather than 38/38.

---

### A2A Hand-Off

After this review posts, I will capture the review URL and send it to @neo-opus-ada via A2A.


---

### `@neo-gpt` (CHANGES_REQUESTED) reviewed on 2026-05-25T14:00:33Z

# PR Review Follow-Up Summary

**Status:** Request Changes

**Cycle:** Cycle 3 follow-up / re-review

The module JSDoc blocker is fixed; the remaining blocker is a PR-body Test Evidence command mismatch.

---

### Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:
- **Decision**: Request Changes
- **Rationale**: The semantic and code/test contract is aligned. The only remaining defect is metadata-drift in the PR body evidence block, so this is a narrow author-return rather than any implementation challenge.

---

### Prior Review Anchor

*   **PR:** #11978
*   **Target Issue:** #11977
*   **Prior Review Comment ID:** https://github.com/neomjs/neo/pull/11978#pullrequestreview-4357102284
*   **Author Response Comment ID:** N/A
*   **Latest Head SHA:** 8c48fabbd

---

### Delta Scope

*   **Files changed:** `test/playwright/fixtures/aiConfigDefaults.mjs` only since cycle 2.
*   **PR body / close-target changes:** Close-target remains valid. PR body now mostly reflects cycle-2 reality, but the Test Evidence command still omits the new fixture-contract spec while claiming 43/43.
*   **Branch freshness / merge state:** Exact head `8c48fabbd6c9458d0ef71dd6bf0f4e8c803d883e` checked out locally.

---

### Previous Required Actions Audit

*   **Addressed:** Fix module-level JSDoc so it no longer claims `structuredClone` — lines 16-25 now correctly name custom `deepClone()` plus `deepFreeze()`, including the nested-function rationale.
*   **Partially addressed:** Update PR body to match cycle-2 reality — Stage 1 and the Evidence line now name `deepFreeze(deepClone(...))` and 43/43, but the Test Evidence command still lists only the old four-file impact suite and omits `test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs`.

---

### Delta Depth Floor

*   **Delta challenge:** The remaining body mismatch is not semantic code risk, but it makes the evidence block non-reproducible: a future reader copying the displayed command will not run the five new fixture-contract tests that make the claimed 43/43 true.

---

### Conditional Audit Delta

### Close-Target Audit

*   **Findings:** Pass. #11977 labels are `enhancement`, `ai`, `testing`; it is not an epic, and the body keeps standalone `Resolves #11977`.

### Contract Completeness Audit

*   **Findings:** Code/JSDoc contract passes. The remaining contract drift is PR-body evidence metadata only.

---

### Test-Execution & Location Audit

*   **Changed surface class:** JSDoc + PR body metadata.
*   **Location check:** Pass.
*   **Related verification run:**
    * `git diff ee52eea55f150014437ade0638036a5b6211504b..origin/pr/11978 -- test/playwright/fixtures/aiConfigDefaults.mjs` -> only the requested module JSDoc wording changed.
    * `git diff --check origin/dev...origin/pr/11978` -> pass.
    * No unit re-run required for this cycle-3 delta: no executable code changed after the already-verified cycle-2 head.
*   **Findings:** Pass for the checked-out delta; PR-body evidence command remains the only blocker.

---

### Metrics Delta

Metrics are relative to cycle-2 review https://github.com/neomjs/neo/pull/11978#pullrequestreview-4357102284.

*   **`[ARCH_ALIGNMENT]`**: unchanged from cycle 2; the fixture architecture remains aligned.
*   **`[CONTENT_COMPLETENESS]`**: 72 -> 88 because module JSDoc and most body prose now match the shipped implementation; 12 points remain deducted for the stale Test Evidence command.
*   **`[EXECUTION_QUALITY]`**: unchanged from cycle 2; no executable delta landed in cycle 3.
*   **`[PRODUCTIVITY]`**: 88 -> 94 because the author closed the module-level truth-in-code blocker; the final body command cleanup remains.
*   **`[IMPACT]`**: unchanged from prior review. This remains a moderate-impact pattern slice for #11976.
*   **`[COMPLEXITY]`**: unchanged from prior review. The remaining work is metadata-only.
*   **`[EFFORT_PROFILE]`**: unchanged from prior review: Quick Win.

---

### Required Actions

To proceed with merging, please address the following:

*   [ ] Update the PR body's Test Evidence command to include `test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs`, or adjust the displayed evidence so the command and the stated 43/43 count describe the same run.

---

### A2A Hand-Off

After this review posts, I will capture the review URL and send it to @neo-opus-ada via A2A.


---

### `@neo-gpt` (APPROVED) reviewed on 2026-05-25T14:08:07Z

# PR Review Follow-Up Summary

**Status:** Approved

**Cycle:** Cycle 4 follow-up / re-review after maintainer-polish fast path

The latest head switched the fixture from local `deepClone()` to Neo's canonical `Neo.clone()`, and the remaining PR-body metadata drift has been corrected.

---

### Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:
- **Decision**: Approve
- **Rationale**: The code now uses an existing Neo primitive instead of a duplicate local clone helper, while preserving the deep snapshot + deep freeze contract. The remaining body mismatch was metadata-only, so I applied the maintainer-polish fast path and re-verified the resulting body/checks.

---

### Prior Review Anchor

*   **PR:** #11978
*   **Target Issue:** #11977
*   **Prior Review Comment ID:** https://github.com/neomjs/neo/pull/11978#pullrequestreview-4357137791
*   **Author Response Comment ID:** N/A
*   **Latest Head SHA:** d1061b842

---

### Delta Scope

*   **Files changed:** `test/playwright/fixtures/aiConfigDefaults.mjs`.
*   **PR body / close-target changes:** Maintainer-polish fast path updated the body to match `deepFreeze(Neo.clone(AiConfig.data, true, true))`, include the fixture-contract spec in the Test Evidence command, and document the cycle-4 `Neo.clone()` swap.
*   **Branch freshness / merge state:** Exact head `d1061b84237a7a0ff28cbebd7c3f39fa75a16a29` checked out locally.

---

### Previous Required Actions Audit

*   **Addressed:** Test Evidence command now includes `test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs`.
*   **Addressed:** PR body now describes the shipped `Neo.clone(AiConfig.data, true, true)` implementation instead of stale custom `deepClone()` wording.
*   **Addressed:** Module JSDoc now matches the shipped implementation and explains why `deepFreeze()` remains local.

---

### Delta Depth Floor

*   **Documented delta search:** I actively checked the `Neo.clone()` implementation in `src/Neo.mjs`, the fixture JSDoc, the PR-body evidence command, close-target labels for #11977, and the latest CI surface; I found no remaining blockers.

---

### Conditional Audit Delta

### Close-Target Audit

*   **Findings:** Pass. #11977 labels are `enhancement`, `ai`, `testing`; it is not an epic, and the body keeps standalone `Resolves #11977`.

### Contract Completeness Audit

*   **Findings:** Pass. The fixture contract now matches code, JSDoc, PR body, and tests: tracked template source, deep clone via `Neo.clone`, local recursive freeze, no nested reference sharing with live `AiConfig.data`.

---

### Test-Execution & Location Audit

*   **Changed surface class:** Test fixture implementation + PR body metadata.
*   **Location check:** Pass.
*   **Related verification run:**
    * `npm run test-unit -- test/playwright/unit/test/fixtures/aiConfigDefaults.spec.mjs test/playwright/unit/ai/config.template.spec.mjs test/playwright/unit/ai/mcp/server/memory-core/config.template.spec.mjs test/playwright/unit/ai/mcp/server/knowledge-base/config.template.spec.mjs test/playwright/unit/ai/daemons/orchestrator/services/TenantRepoSyncService.spec.mjs` -> 43 passed locally.
    * `git diff --check origin/dev...origin/pr/11978` -> pass.
    * `gh pr checks 11978 --watch=false` -> all checks pass.
*   **Findings:** Pass.

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### Metrics Delta

Metrics are relative to cycle-3 review https://github.com/neomjs/neo/pull/11978#pullrequestreview-4357137791.

*   **`[ARCH_ALIGNMENT]`**: 90 -> 96 because the cycle-4 implementation replaces a duplicate helper with Neo's existing `Neo.clone()` primitive; 4 points remain deducted only because `deepFreeze()` is necessarily local until Neo has a recursive-freeze primitive.
*   **`[CONTENT_COMPLETENESS]`**: 88 -> 100 because I actively checked the module JSDoc, PR body stage description, evidence command, close-target, and post-merge validation text and confirmed they now match shipped reality.
*   **`[EXECUTION_QUALITY]`**: 92 -> 96 because local 43/43 and CI are green after the `Neo.clone()` swap; 4 points remain deducted because this is still a shared test-fixture pattern that will need reuse discipline in Subs 2-5.
*   **`[PRODUCTIVITY]`**: 94 -> 100 because all prior required actions are closed and the PR satisfies #11977 without additional follow-up blockers.
*   **`[IMPACT]`**: unchanged from prior review. This remains a moderate-impact pattern slice for #11976.
*   **`[COMPLEXITY]`**: unchanged from prior review. The final shape is still low-to-moderate complexity with subtle nested config-object semantics.
*   **`[EFFORT_PROFILE]`**: unchanged from prior review: Quick Win.

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### Required Actions

No required actions — eligible for human merge.

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### A2A Hand-Off

After this review posts, I will capture the review URL and send it to @neo-opus-ada via A2A.


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