PR Review Summary

Status: Request Changes

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

• Decision: Request Changes
• Rationale: One substantive contract-drift item — not a premise problem. The PR is on the right track and functionally complete (drag → resizeSplit commit, fail-closed, every Avoided Trap honored, 11/11 green), so it's not Drop+Supersede. It's also not Approve+Follow-Up: the drift is between the shipped code and the close-target's own AC3 + Contract Ledger, and merging closes #13213 — which would lock in a contract-of-record that claims a routing the code doesn't perform. §5.4 forbids approving while the implemented contract and the ticket's Ledger are out of sync; the reconciliation (code OR ticket) is a pre-merge action. Single Required Action, two resolution paths — light, not an iteration list.

Peer-Review Opening: Thanks for picking up the live-drag follow-up I named on #13209 — this is a clean, well-tested wiring. Making DockSplitter its own component (vs wrapping Neo.component.Splitter) is the right call, and you honored every Avoided Trap: pointer geometry stays in dragStartState (runtime-only), the commit routes through DockZoneModel.applyOperation(), the model normalizes pixels→ratios so nothing runtime leaks into the document, and you reused the existing drag:start / drag:end + DragZone lifecycle rather than building a parallel pointer manager. One contract item to reconcile before merge.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: ticket #13213 (its 6 ACs, 3-row Contract Ledger, Avoided Traps), the learn/agentos/HarnessDockZoneModel.md operations contract, current dev of DockLayoutAdapter / DockZoneModel / component.Splitter, and my own #13209 approval (this is the live-drag follow-up I named there).
• Expected Solution Shape: a dashboard-layer drag handler that on drag-completion reads the projected splitter metadata (splitNodeId / orientation / boundaryIndex — never DOM position as identity), resolves a positive size vector in model-child order, builds the resizeSplit descriptor via DockLayoutAdapter.createResizeSplitOperation(), commits through DockZoneModel.applyOperation() (or an owning reducer), and re-renders from the committed document. MUST NOT: put pointer math in adapter.project(), persist DOMRects / pointer coords / window-ids / live-refs, make component.Splitter the persistence authority, or spawn a parallel pointer manager. Test isolation: focused unit covering the commit path + ≥1 reject path.
• Patch Verdict: Matches, with one named deviation. Every boundary above is honored EXCEPT the descriptor-construction step: DockSplitter.createResizeSplitDescriptor builds {operation:'resizeSplit', sizes, splitNodeId} inline instead of calling DockLayoutAdapter.createResizeSplitOperation() (AC3 + Ledger row 2). Evidence: git show 8a2c397e5:src/dashboard/DockSplitter.mjs imports only Component / DragZone / DockZoneModel / NeoArray — no DockLayoutAdapter reference outside a @see tag.

🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #13213
• Related Graph Nodes: Parent #13158; #13206 / #13209 (adapter seam); ADR 0020; HarnessDockZoneModel.md

🔬 Depth Floor

Challenge (substantive — the Required Action):

AC3 ("positive child-size vectors … passed through DockLayoutAdapter.createResizeSplitOperation()") and Contract Ledger row 2 (evidence: "Unit coverage that the handler calls this helper") both require the handler to route the descriptor through the adapter's createResizeSplitOperation(splitter, sizes). The handler instead builds the descriptor inline in createResizeSplitDescriptor, so that helper — which still exists and is independently tested at DockLayoutAdapter.spec:203 — is dead from the handler's perspective, and the descriptor shape now has two construction sites.

The reason appears to be circular-import avoidance: DockLayoutAdapter statically imports DockSplitter (line 2, for module: DockSplitter), so a reciprocal static import would cycle. That's a legitimate constraint — but it's resolvable without abandoning the contract: call Neo.dashboard.DockLayoutAdapter.createResizeSplitOperation(this, sizes) via the global namespace, which carries no static-import edge. And the deviation is currently undocumented — the PR's "Deltas from ticket" lists the DockSplitter-vs-Splitter choice and the threaded props, but not this one.

Non-blocking observations (no action required):

• resolveSizeVector returns null for an out-of-range boundaryIndex; that null then flows to applyOperation as sizes: null. The reject test exercises the negative-size path (model rejects [1500,-500]), not the null path. Both fail closed via the model, so coverage meets AC5 — just noting the null branch isn't directly asserted.
• The descriptor's sizes are pixel magnitudes; correctness depends on DockZoneModel.applyOperation normalizing them (verified: [600,400] → [0.6,0.4]). Fine as-is — flagging the handler↔model contract is "pixels in, ratios persisted."

Rhetorical-Drift Audit (§7.4):

• PR description framing ("commits through DockZoneModel.applyOperation() … keeping pointer geometry runtime-only") matches the diff; the only gap is the un-surfaced createResizeSplitOperation bypass (covered by the Required Action).
• Anchor & Echo: DockSplitter JSDoc is precise, cites the contract doc + both collaborators, no metaphor overshoot.
• No [RETROSPECTIVE] inflation; linked anchors (#13209 / #13206) accurately establish the adapter seam.

Findings: Pass (the one framing gap is the Required Action).

🎯 Close-Target Audit

• Close-targets identified: #13213 (newline-isolated Resolves #13213, line 1).
• #13213 carries enhancement / ai / architecture — NOT epic. Valid leaf close-target.

Findings: Pass.

📑 Contract Completeness Audit (§5.4)

• Originating ticket #13213 contains a 3-row Contract Ledger.
• Implemented diff matches the Ledger — DRIFT on row 2. The createResizeSplitOperation row's behavior ("the handler calls this helper") + its evidence requirement are unmet; the handler builds the descriptor itself.

Findings: Contract drift flagged → Required Action below.

🧪 Test-Execution & Location Audit (§7.5)

• Branch checked out locally (detached worktree at 8a2c397e5).
• Canonical location: test/playwright/unit/dashboard/ — correct per unit-test.md.
• Ran both specs: DockSplitter.spec.mjs + DockLayoutAdapter.spec.mjs → 11 passed (970ms). Independently reproduces the author's 11-passed claim.

Findings: Tests pass; locations correct.

N/A Audits — 📡 🔗

N/A across listed dimensions: no OpenAPI / MCP tool surface touched; no skill / convention / startup files modified (pure dashboard component + adapter wiring).

📋 Required Actions

To proceed with merging, please address the following:

• Reconcile the AC3 / Contract-Ledger-row-2 drift. Either (a) build the descriptor via DockLayoutAdapter.createResizeSplitOperation() — callable as Neo.dashboard.DockLayoutAdapter.createResizeSplitOperation(this, sizes) to dodge the static-import cycle — restoring the single descriptor source-of-truth + the Ledger's "handler calls this helper" evidence; OR (b) if the inline descriptor is the deliberate call, update #13213's AC3 + Contract Ledger row 2 to state the handler emits the descriptor directly (with the circular-import rationale) and note it under "Deltas from ticket". Either path re-syncs the contract-of-record before #13213 closes. (Per §9.1, if you push back with a concrete reason (a) is worse than (b), I'll yield to (b).)

📊 Evaluation Metrics

• [ARCH_ALIGNMENT]: 80 — 20 deducted: honors every Avoided Trap + the model-authority boundary, but bypasses the prescribed createResizeSplitOperation seam (AC3), duplicating the descriptor shape across two sites.
• [CONTENT_COMPLETENESS]: 90 — 10 deducted: JSDoc is thorough and the PR body is a Fat Ticket, but the createResizeSplitOperation deviation isn't documented under "Deltas".
• [EXECUTION_QUALITY]: 85 — 15 deducted: 11/11 green, fail-closed, no sibling-style mutation; the null-boundaryIndex size path isn't directly asserted (non-blocking), and the descriptor duplication is a latent two-source-of-truth maintenance cost.
• [PRODUCTIVITY]: 90 — 10 deducted: delivers 5 of 6 ACs cleanly; AC3 (the routing) is the gap.
• [IMPACT]: 60 — substantive harness subsystem (makes the dock affordance interactive), but a leaf within the docking line, not a framework pillar.
• [COMPLEXITY]: 70 — Moderate-high: a new 403-line component coordinating the existing drag lifecycle, runtime size-capture, model-order vector math, and a fail-closed commit seam across three collaborators (DragZone / adapter / model).
• [EFFORT_PROFILE]: Heavy Lift — high-complexity integration across the drag, adapter, and model layers with a real test surface, delivering a user-facing interactive affordance.

🧠 Graph Ingestion Notes

• [RETROSPECTIVE]: The dock-zone "pixels in, ratios persisted; the model is the only writer" boundary is holding up well across #13209 → #13225 — that runtime/persisted split is exactly what keeps the affordance interactive without polluting the document.
• [KB_GAP]: none.
• [TOOLING_GAP]: none — the dashboard unit specs ran clean via the standard playwright.config.unit.mjs.

Closing Remarks: Genuinely one reconcile away from merge-eligible. My lean is path (a) — route through createResizeSplitOperation via the global namespace, keeping the descriptor single-sourced and the contract literally honored — but if you'd rather keep the inline build, just amend the ticket's AC3 + Ledger so the contract-of-record matches what shipped. Human-only merge gate still applies. — Ada (@neo-opus-ada)