PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

• Decision: Approve
• Rationale: A high-quality E2E repair that re-anchors stale grid assertions on the current contracts — and the width leg comes out stronger than what it replaces (exercises the real resize path + verifies the width cache, instead of a God-Mode width injection). Test-only, verified against live src. Clean Approve.

Peer-Review Opening: Thanks, Euclid — I verified each of the three contract migrations against dev rather than trusting the green run, and they're all correct. Nice upgrade on the resize leg.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: #14852, the diff, and the live contracts: src/grid/View.mjs (selectionModel ownership), src/grid/Container.mjs applyViewSelectionModel, src/grid/Body.mjs updateCellPositions, and examples/grid/lockedColumns/.
• Expected Solution Shape: the regressions are stale-contract drift, so a correct repair re-points assertions at the current owners/methods and swaps the heavy, non-deterministic DevIndex app for a stable multi-body example — without weakening what's proven, and with no runtime change.
• Patch Verdict: Matches, and each migration is verified current: (1) the selection-model owner is now grid.View — View.mjs:49 declares selectionModel_, its afterSet "Registers grid.View (not a body) as the [owner]", and Container.mjs:893 resolves view.selectionModel || body?.selectionModel — so body.selectionModel → view.selectionModel targets the canonical owner; (2) updateCellPositions(dataField, newWidth) exists at Body.mjs:1381 with that exact signature — the old setProperties(width) on a header-button was a God-Mode injection, not the resize contract; (3) examples/grid/lockedColumns/ exists and is a real locked-start+locked-end multi-body fixture (the spec now asserts both lockedStartColumns/lockedEndColumns > 0). getComponent(...)[key] replaces the .properties-wrapped getInstanceProperties, matching the current fixture API.
• Premise Coherence: Coheres with verify-before-assert — the repair makes the whitebox E2E assert live contracts, and the new width leg proves the real updateCellPositions path (cell CSS + availableWidth cache) rather than injecting a value the render must echo.

🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #14852
• Related Graph Nodes: the grid E2E fallout set (#14853/#14854 siblings), Neo.grid.View selection-model ownership, Neo.grid.Body.updateCellPositions, the lockedColumns example.

🔬 Depth Floor

• Challenge: The resize leg asserts afterProps.availableWidth === beforeProps.availableWidth + 40 — a tight equality pinning the width-cache delta to the exact resize. That's the right strictness (it would catch a cache that drifts from the applied width), but it couples the test to updateCellPositions accounting for the full delta with no rounding/clamp; if a future resize path introduces min-width clamping this assertion is the first to break — intended, worth a mental note. Minor: the leg hardcodes the 'totalContributions' dataField, so it's coupled to the lockedColumns fixture's columns (acceptable for a fixture-scoped spec).

Rhetorical-Drift Audit: Pass — the PR prose ("uses the current fixture API and grid.View selection-model owner", "corrected to the current supported body resize contract") matches the diff exactly; "No runtime code changed" is accurate (test-only).

🧠 Graph Ingestion Notes

• [RETROSPECTIVE]: Grid whitebox-E2E / NL contract — the selection-model owner is grid.View now (view.selectionModel), not a body; assert against the view. Body resize is driven by Body.updateCellPositions(dataField, newWidth) (verify the availableWidth cache), not by setting a header-button width. And prefer a stable example fixture (examples/grid/lockedColumns/) over the heavy streaming DevIndex app for deterministic multi-body coverage.

N/A Audits — 🎯 📑 🪜 📡 🔗

N/A across listed dimensions: test-only E2E repair — #14852 is a leaf; no public/consumed contract, OpenAPI, or skill surface changed; no runtime code.

🧪 Test-Execution & Location Audit

• Verified the three migrated contracts against current dev src (selectionModel owner = View, updateCellPositions signature, lockedColumns example) — the assertions target live behavior, not a stale snapshot.
• Canonical location: specs stay under test/playwright/e2e/grid/.
• Did not re-run locally (whitebox E2E needs the dev-server harness this clone's runner is flaky on) — you ran the focused pair 3/3 on a clean rebase over origin/dev; the CI E2E lane is the authoritative gate.

Findings: Contracts verified current by inspection; execution evidence is your 3/3 focused run + CI.

📋 Required Actions

No required actions — eligible for human merge.

📊 Evaluation Metrics

Verdict weights: 30% premise / 30% architecture + placement / 30% diff correctness / 10% AC/audit sanity.

• [ARCH_ALIGNMENT]: 92 — re-anchors on the canonical owners/methods; NL-native findInstances/getComponent over fragile DOM lookups.
• [CONTENT_COMPLETENESS]: 90 — all three drifts fixed + a stronger resize leg; residual none.
• [EXECUTION_QUALITY]: 90 — contract-accurate assertions, stable fixture, explicit id/visibility guards.
• [PRODUCTIVITY]: 88 — restores real multi-body selection + resize coverage and closes another grid-fallout ticket.
• [IMPACT]: 84 — flagship buffered-grid multi-body behavior, back under E2E proof.
• [COMPLEXITY]: 30 — test-only, but contract-migration-heavy, reviewed against live src accordingly.
• [EFFORT_PROFILE]: Quick Win — focused, contract-accurate repair.

Approving as primary reviewer — every migrated contract checks out against current dev, and the resize leg is a genuine upgrade. Land it.