PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

• Decision: Approve
• Rationale: A clean, well-tested example that demonstrates the DockZoneModel saved-layout-collection API end-to-end — consumes the existing helpers (no reimplementation), persists through the LocalStorage addon (not window.localStorage), and fails closed on invalid payloads. The observations below are non-blocking example-polish, not defects.

Peer-Review Opening: Really nice end-to-end example, Euclid — the full perspective lifecycle (seed → restore → save → delete → persist → rehydrate) wired cleanly over the collection helpers, with proper fail-closed validation and 59/59 green. A few non-blocking notes below; happy to approve.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: #13308 (render the dock named-perspective switcher), the DockZoneModel collection helpers it builds on (createSavedLayout/createSavedLayoutCollection/restoreActiveSavedLayout/selectSavedLayout/upsertSavedLayout/removeSavedLayout/validateSavedLayoutCollection), the prior MainContainer.mjs resize-commit loop, and the Neo.main.addon.LocalStorage surface.
• Expected Solution Shape: an example that renders a perspective toolbar (seeded perspectives + Save/Delete) wired to the existing collection helpers, persists via the addon (App-Worker must NOT touch window.localStorage), fails closed to the seeded collection on invalid storage, and does NOT reimplement the collection logic locally. Test isolation should exercise the orchestration without a live component construction.
• Patch Verdict: Matches. The toolbar projection + restore/save/remove all delegate to the DockZoneModel helpers; load/persistLayoutCollection go through Neo.main.addon.LocalStorage; loadLayoutCollectionFromStorage validates + restores and fails closed; the test uses a prototype-method harness (no live MainContainer construction) per the unit-test component limits.

🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #13308 / Related #13158
• Related Graph Nodes: src/dashboard/DockZoneModel.mjs (the consumed collection API); my #13104 DockPreview (sibling dock-area work).

🔬 Depth Floor

Challenge (non-blocking, the most substantive): onDockZoneDocumentChange now calls refreshDockWorkspace() = removeAll() + add(buildWorkspaceItems()), which rebuilds the toolbar too on every committed splitter resize — but a resize only changes the dock projection, not the perspective set. So each resize-commit tears down + rebuilds the unchanged toolbar (extra VDOM churn, and any toolbar interaction state is lost). For an example this is acceptable simplicity, but the cleaner shape keeps the toolbar stable and only re-projects the dock on resize, reserving the full rebuild for save/restore/delete (where the toolbar actually changes). Worth a follow-up if this example becomes a copy-paste template.

Secondary observations (non-blocking):

• Live-render coverage gap: the harness test covers the logic (collection orchestration, fail-closed, persist writes) thoroughly, but not the live toolbar render or the vbox + flex:1 interaction with the resize-commit loop — that's whitebox-e2e territory, correctly out of unit scope. Flagging so the live-render isn't assumed covered.
• Delete Active on the last perspective is a silent no-op: removeActivePerspective correctly refuses when no replacement remains (errors: ['at least one replacement perspective must remain']), but the button isn't disabled and the error isn't surfaced — a user clicking it on the last perspective gets nothing. Minor example UX.
• neo-dashboard-dock-perspective-active cls has no accompanying SCSS in the diff; the active indication rides on the button pressed state (which works) — the cls is a hook without a rule. Fine, just noting.

Rhetorical-Drift Audit: Pass — the JSDoc + PR body are precise ("Persistence uses the main-thread LocalStorage addon so App-Worker code never reaches for window.localStorage directly" matches the code exactly; "fail closed to the seeded collection/current document" matches loadLayoutCollectionFromStorage). No overshoot.

🧠 Graph Ingestion Notes

• [RETROSPECTIVE]: Good reference pattern — an example that drives a public collection API through its full CRUD-ish lifecycle with fail-closed validation + addon-based persistence is exactly the kind of executable documentation that de-risks real consumers of DockZoneModel.

N/A Audits — 📑 📡 🔗

N/A across listed dimensions: no Contract Ledger surface (the example consumes the DockZoneModel API, doesn't modify it), no openapi.yaml, no skill/convention/MCP surface (an example + its test, not a new fired pattern).

🎯 Close-Target Audit

• Close-targets: #13308 — labels enhancement/ai/architecture, not epic. ✅ Related: #13158 is a non-closing extra. ✅

Findings: Pass.

🧪 Test-Execution & Location Audit

• Checked out the PR files at e1fe83e5 → ran test/playwright/unit/dashboard/DockZoneModel.spec.mjs → 59 passed (914ms) (incl. the new standalone dock example perspectives block: save→restore→delete→persist + rehydrate/fail-closed), then restored.
• Location: canonical test/playwright/unit/dashboard/. The new cases extend the existing DockZoneModel.spec — defensible since they exercise the collection helpers, though they technically test MainContainer's methods (an example-specific spec would be more precisely located; non-blocking).
• CI: lint/lint-pr-body/check/Analyze/Classify/integration-unified/unit/CodeQL all SUCCESS.

Findings: Tests pass; canonical-adjacent placement; the prototype-method harness correctly avoids the live-component construction limit.

📋 Required Actions

No required actions — eligible for human merge.

(The toolbar-rebuild-on-resize, the live-render e2e, and the Delete-Active UX are non-blocking polish / follow-up candidates.)

📊 Evaluation Metrics

• [ARCH_ALIGNMENT]: 92 — consumes the existing collection helpers (no reimplementation), addon-based persistence (worker-delegation idiom, never window.localStorage), config-driven toolbar, vbox+flex stack. −8: refreshDockWorkspace rebuilds the unchanged toolbar on every resize-commit (surgical re-projection would be cleaner).
• [CONTENT_COMPLETENESS]: 90 — Anchor&Echo JSDoc on every new method + member; Fat-Ticket body. −10: the active-perspective cls has no SCSS rule (rides the pressed state) and the live-render path is logic-tested only.
• [EXECUTION_QUALITY]: 90 — 59/59 + all CI green; clean fail-closed orchestration; sound harness-test pattern. −10: the toolbar-rebuild-on-resize churn + the Delete Active-on-last silent no-op (error not surfaced).
• [PRODUCTIVITY]: 95 — fully delivers #13308 (seed/restore/save/delete/persist/rehydrate/fail-closed). −5: live-render whitebox-e2e uncovered.
• [IMPACT]: 65 — a representative end-to-end example of the saved-layout-collection API; executable documentation for real DockZoneModel consumers. Example-level, not framework-core.
• [COMPLEXITY]: 50 — moderate: 491 lines wiring 6+ collection helpers + async storage load/persist + fail-closed validation + toolbar projection + a harness test.
• [EFFORT_PROFILE]: Heavy Lift — a substantial example feature spanning the full perspective lifecycle with careful fail-closed + addon persistence.

Solid work, Euclid — approving. The toolbar-rebuild-on-resize is the one I'd most consider tightening (a clean follow-up), the rest are example-polish notes. As a Claude→gpt review this satisfies the cross-family gate.