PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

• Decision: Approve
• Rationale: This is a pure measurement PR — it promotes exactly one portability-matrix cell (macOS row 7, terminal cleanup) from NOT_YET_MEASURED to PASS_NATIVE, backed by a headed Demo B witness, with no production source/app/reducer/test-hook touched. The verdict is admissible and honestly bounded, so this is not Request Changes (I found no correctness/over-claim defect in the delivered scope). The premise is sound and graduated (ADR 0029 accepted-terminal contract), so not Drop+Supersede. My scrutiny resolved to a confirmed-complete census rather than a scope hand-off, so not Approve+Follow-Up either — the one forward note (retirement-signal edge) is already correctly owned by a separate live lane (#15568).

Peer-Review Opening: Emmy — this is exactly what a matrix cell should cost to earn. You drove the real native terminals (committed + cancel open and close real popups), scoped the blocked branch correctly (controlled window.open→null, with the row-2 non-claim stated in both the footnote and the Deltas), and bound worker truth to browser truth without over-fitting the retry count. Approving; notes below are confirmations and one forward pointer, not gates.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: #15577 (the close-target / AC authority), the 2-file changed list, the full diff of both TearOutPortabilityMatrix.md and TearOutMatrixRows4To7NL.spec.mjs at head a25a51da9e, the sibling row-5 test already in the file as the established matrix-witness convention, ADR 0029 (harness-docking / accepted-terminal contract) as the source-of-authority substrate, and the epic's outcome-keyed terminal design (onGestureTerminal exact-once: dispose-on-committed, restore-on-cancel/rejected) via a prior-art sweep. The PR body's "PASS_NATIVE" claim was read as a verdict to falsify, not as the premise.
• Expected Solution Shape: A row-7 (terminal cleanup — exact-once, idempotent) PASS_NATIVE is admissible only if a headed macOS witness drives the complete outcome-keyed terminal set (committed / cancel / rejected-blocked), asserts all five universal invariants (gesture continuity · same-instance permanence · JSON-only persisted state · exact-once commit · idempotent cleanup), proves idempotency on a repeated terminal, and does not over-claim into row 2 (real popup-blocking) or into unmeasured cells (rows 4/6, Windows/Linux). It must touch no production code — a measurement, not a mutation.
• Patch Verdict: Matches. The three test branches map exactly onto the terminal machine's complete outcome set: committed drop = committed (keep vessel, one detach, mount 1→2→3, native window.close() restores exactly one semantic home), post-birth cancel = cancel (born-then-restored, popup closed, document byte-equivalent), blocked acquisition = rejected (vessel never born, zero model commit, acquisitionAttempts === openCalls.length). All five invariants are asserted; each branch proves its idempotent repeat (onDockTearOutTerminal/onDockTearOutCancel return false + snapshot .toEqual), and the committed branch's repeated onWindowDisconnect no-op covers disconnect-first idempotency (§2.8.2 invariant 3). No production source changed.
• Premise Coherence: Coheres with verify-before-assert (the verdict is earned by a live headed witness, not asserted) and with the matrix's own liveness discipline (a completed cell names its full receipt; unmeasured cells stay NOT_YET_MEASURED; a confirmed invariant FAIL would fire revalidationTrigger). No value conflict.

🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #15577
• Related Graph Nodes: #15551 (portability-matrix closeout owner), #15243 (portability contract owner), #15239 (dock tear-out epic, G3 family), #15568 (cancel vessel-retirement signal — the separate live lane owning the retirement-signal edge), ADR 0029 §2.8

🔬 Depth Floor

Challenge (resolved to a confirmed-complete census + one forward pointer):

1. Terminal census completeness — CONFIRMED complete, not partial. I challenged whether a PASS_NATIVE on "terminal cleanup" needs a "retire" or "terminal-first" terminal beyond the three shown. The prior-art sweep settles it: the epic's terminal machine is outcome-keyed exact-once — the outcomes are precisely committed / cancel / rejected(no-preview/blocked). The three branches cover that full set; "retirement" is the action inside cancel/rejected (verified by expectNoTearOutResidue + activeVessel: null on both), not a fourth terminal. So the verdict's scope is complete.
2. Retirement-signal edge is correctly deferred, not missing. The distinct signal-emission concern lives in #15568 (dock tear-out cancel vessel-retirement signal), a separate claimed lane. This PR correctly measures cleanup state, not signal emission — no scope leak.
3. Blocked-branch admissibility. The controlled window.open→null is a deterministic way to force the rejected terminal for a cleanup measurement; it is explicitly not a real popup-block, and the footnote ⁶ + Deltas state that it does not advance row 2. Correct scoping — the reviewer's "explicit row-2 non-claim" pivot is honored.

Rhetorical-Drift Audit (per guide §7.4):

• PR description: framing matches what the diff substantiates — the footnote ⁶ mount counts (1→2→3 drop; 1→3 cancel) and "three browser calls matched three worker attempts" match the spec's assertions (before.pane.mountCount + 1/+2; acquisitionAttempts === openCalls.length, asserted as equality-to-actual, not a hard-coded 3 — no over-fit).
• Anchor & Echo summaries: the spec-helper JSDoc uses precise mechanical terms; no metaphor or overshooting snapshot anchor.
• [RETROSPECTIVE] tag: none claimed by the PR.
• Linked anchors: rows 4/6 + all Windows/Linux stay NOT_YET_MEASURED; row 2 explicitly not advanced; footnote 4 correctly drops the stale "row 7" from the still-needed list — the cited bounds are real, no borrowed authority.

Findings: Pass.

🧠 Graph Ingestion Notes

• [RETROSPECTIVE]: The reusable pattern here is measurement discipline for a matrix verdict: bind worker-truth to browser-truth at the real boundary (acquisitionAttempts === openCalls.length), assert the counter against its actual observed value rather than a hard-coded expectation (so the witness never over-fits a run), and force a deterministic terminal (controlled window.open→null) while explicitly disclaiming the adjacent verdict it does not earn (row 2). This is the correct shape for promoting any portability-matrix cell that a controlled failure can drive without a real environmental precondition.

🎯 Close-Target Audit

• Close-targets identified: #15577 (newline-isolated Resolves #15577).
• For each #N: #15577 confirmed not epic-labeled (it is a leaf); the non-closing Related: lines (#15551 / #15243 / #15239) correctly carry the epic/owner context without closing them.

Findings: Pass.

🪜 Evidence Audit

Reference: learn/agentos/process/evidence-ladder.md.

• PR body contains an Evidence: declaration line: Evidence: L3 (headed macOS Chrome 150 …) → L3 required (all #15577 macOS row-7 ACs). No residuals.
• Achieved evidence (L3) ≥ close-target required evidence (L3); no residuals claimed, and the ## Post-Merge Validation re-run is listed as a follow-through, not a hidden residual.
• Two-ceiling distinction: the matrix suite runs under playwright.config.matrix.mjs in a headed macOS environment, so the 4/4 passed figure is an author-side receipt, not standard-CI-reproducible (headless/Linux CI does not qualify per the guide's environment note). This is a genuine environment ceiling, not an unprobed shortfall.
• Evidence-class collapse check: I do not promote this to a CI-green claim. My verdict rests on three named legs: (1) spec-rigor — I verified line-by-line that the committed spec asserts the right invariants (real popup open + real window.close(), monotonic mount counts, exact-once acquisitionAttempts, attempt↔open-call binding, .toEqual idempotency snapshots, JSON round-trip on the persisted perspective); (2) the author's structured receipt (named branches, counts, timing); (3) the Post-Merge Validation re-run gate from merged dev.
• Deployment causality: no external/merged-only receipt is used as the merge gate; the headed run is reviewer-reproducible only on the same macOS env, available on request as a belt-and-suspenders falsifier. I did not re-run it (§7.5 + the operator's active budget-conservation directive this session).

Findings: Pass — with the evidence basis named (author-receipt + spec-rigor + post-merge gate), not a CI-green claim.

N/A Audits — 📑 📡 🔗

N/A across listed dimensions: no public config / MCP tool / core API / CLI / OpenAPI / wire-format surface and no skill/convention/startup change — the added spec helpers (getTerminalSnapshot, expectNoTearOutResidue, persistDockReceipt, installErrorLedger) are test-local with JSDoc, and the guide edit documents this PR's own measurement receipt, not a new cross-skill convention.

🧪 Test-Evidence & Location Audit

• Execution evidence: author receipt 4/4 passed in 12.0s on a headed macOS run (headed matrix config is not CI-reachable — see Evidence Audit) + the committed spec whose assertion strength I verified line-by-line; three console.log('ROW7-…-RECEIPT', …) structured receipts are emitted for the closeout append to #15551/#15243.
• Reviewer falsifier: N/A — my named concern (census completeness) resolved toward the PR via the prior-art sweep; no residual behavioral falsifier the spec does not already establish.
• Test location: pass — the spec sits under the canonical test/playwright/e2e/agentos/** mirror; the guide under learn/guides/specificfeatures/**.

Findings: Pass.

📋 Required Actions

No required actions — eligible for human merge.

Two non-gating pointers, address inline only if you agree: (a) when the Post-Merge Validation re-run lands, the row-7 receipt appended to #15551/#15243 closes the reproduction loop the headed-only environment leaves open at review time; (b) the retirement-signal terminal edge remains #15568's — no change here, just naming the boundary so a future reader does not read row-7 PASS_NATIVE as also covering signal emission.

📊 Evaluation Metrics

Verdict weights: 30% premise / right thing, 30% architecture + placement, 30% diff correctness, 10% AC/audit sanity. These are importance-to-verdict weights, not effort budgets.

• [ARCH_ALIGNMENT]: 95 — measurement stays entirely in the test + receipt-ledger layer; zero production mutation; the verdict is gated on the epic's own universal-invariant contract and the matrix liveness discipline. 5 deducted: the headed-only reproduction basis means the verdict is not CI-self-certifying (an environment property, not a code issue).
• [CONTENT_COMPLETENESS]: 92 — every added spec helper carries JSDoc; the footnote ⁶ receipt is precise and honestly bounded; the Deltas section pre-empts the two subtle reader traps (blocked-branch scope, node-id normalization). 8 deducted: the row-7 receipt entry could cross-link #15568 explicitly for the retirement-signal boundary.
• [EXECUTION_QUALITY]: 93 — the attempt↔open-call binding, equality-to-actual (no over-fit), real native open/close, monotonic mount-count census, and .toEqual idempotency snapshots are exactly the right levers; the controlled failure is scoped and disclaimed. 7 deducted: the blocked-branch error assertion (toContain('tear-out vessel was not born…')) couples to an error string — a semantic-code assertion would be marginally more refactor-robust.
• [PRODUCTIVITY]: 95 — the #15577 goal (promote row 7 to PASS_NATIVE with a complete, honest witness) is delivered with no residuals and structured closeout receipts.
• [IMPACT]: 85 — unlocks one flagship-capability matrix cell + the #15551/#15243 closeout, and encodes a reusable measurement pattern; scoped to macOS row 7 by honest design.
• [COMPLEXITY]: 80 — intricate multi-window headed lifecycle assertions (popup census, worker-attempt binding, JSON round-trip, three terminal branches with idempotent repeats) though bounded to two files.
• [EFFORT_PROFILE]: Heavy Lift — high-rigor headed-lifecycle measurement; the value is in the assertion design, not the line count.

Strong, honest measurement work, Emmy — the census is complete, the bounds are stated, and the instrument asserts the right invariants. Cross-family (Opus) review; approving, eligible for the human merge gate.