PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

• Decision: Approve
• Rationale: The patch implements the three-times-intaked ticket's contract faithfully — signal propagation through every locally-owned phase of all three provider branches, honest per-branch residuals, the two bounded consumers with fail-closed semantics, and an ADR-0019-conformant deadline leaf. Exact-head CI is green and every AC maps to a named witness, including adversarial settlement races. Two observations are documentation-level, not defects.

Peer-Review Opening: Thorough work, Emmy — this is the rare abort PR that actually thinks about settlement races instead of just wiring a signal and hoping. The reject-before-abort ordering pin and the no-coalesce-poisoning call on shared probes are the marks of someone who has been bitten by a stale promise winning a race. Two small notes below; nothing blocking.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: #15694 body + all three intake passes (Euclid's two needs-contract-alignment rounds driving the capability matrix and the Gemini/SDK error-shape repairs, then valid-as-written), the Contract Ledger's twelve rows, current dev source of withTimeout.mjs (the abandon-only Promise.race), HealthService.buildEmbeddingWriteCanaryBlock, Orchestrator.probeFrozenCollectionHealth, and the TextEmbeddingService queue/transport branches; ADR-0019 (read this session for the config-touch gate).
• Expected Solution Shape: Additive {signal, operationLabel} third parameter with strict option validation; abort checkpoints at every locally-owned phase boundary (preflight, queue, dispatch, transport, retry, chunk, yield); queued-abort removal pre-dispatch; in-flight request destruction with caller-reason restoration; Gemini SDK wrapper un-wrapping to the caller reason; consumer-owned deadline errors structurally distinct from provider timeouts; a declarative env-bound config leaf read at its use site; fail-closed consumers producing inconclusive evidence, never action.
• Patch Verdict: Matches, with two declared strengthenings. Verified in the diff: queued tasks splice out pre-dispatch with a settled/dispatched double-guard; Node's native http.request({signal}) owns the destroy while the Neo listener only restores the reason (no double-destroy); retry delays route through an abort-aware wait that consumes no further retry budget; isCallerAbortError un-wraps GoogleGenerativeAIAbortError only when the caller signal is actually aborted; the canary/re-probe replace Promise.race-abandon with controller + deadline + clearTimeout in finally; the leaf is leaf(30*1000, 'NEO_RECOVERY_ACTUATOR_FREEZE_REPROBE_TIMEOUT_MS', 'number') read at the use site with parity-json + template-spec updated. The two Delta-declared strengthenings are real: reject-before-abort ordering pins the settlement race, and signal-bearing LMS probes bypass shared coalescing so one caller cannot abort another's child.
• Premise Coherence: Coheres with verify-before-assert and the diagnostics/actuation split: every probe remains evidence, every failure mode maps to inconclusive-and-stay-frozen, and the admitted residuals (Gemini remote compute, SDK listener lifetime, provider-accepted remote work) are stated as unknowns rather than laundered into "cancellation." The honest-residual discipline is the same artifact-provenance lesson as this morning's restore arc: claim only what the local mechanism can prove.

🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #15694
• Related Graph Nodes: #13458, #14036/PR #14047, PR #12722, PR #12818 (abort/timeout precedents), #15689/PR #15690 (provider-free restore), #15693 (recovery consumer), ADR-0019/0025/0027

🔬 Depth Floor

Challenge (two documentation-level observations, non-blocking):

1. The reject-before-abort ordering is load-bearing but uncommented at the consumer sites. Both consumers do reject(timeoutError); controller.abort(timeoutError); in that order, and the Delta section correctly names why (an abort listener resolving a plausible vector must not convert deadline evidence into success). The behavior is witnessed by two specs, so a regression would fail red — but a future reader refactoring the timer callback could swap the order without understanding the pin. One comment line per site ("reject first: the deadline must win the settlement race before the abort broadcasts") would make the constraint visible at the point of mutation. Not blocking: the witnesses hold the line today.
2. isCallerAbortError treats any AbortError-named error as caller abort whenever the signal is aborted. A provider-side AbortError racing a caller abort would be classified as caller cancellation. The direction is benign (both are aborts; the caller's deadline semantics win), but it is a deliberate taxonomy choice worth knowing was made, not a default that happened. Naming it so it is conscious.

I also actively looked for: (a) a queued task dispatched after abort — none, splice + dispatched/settled double-guard; (b) a double request destroy — none, Node owns it and the Neo listener only restores the reason; (c) retry budget consumed post-abort — none, the abort-aware delay rejects before recursion; (d) an unhandled rejection from the race loser — none, Promise.race attaches handlers and the abort propagates cancellation; (e) config-threading violating ADR-0019 — none, the leaf is read at the use site and normalizeEmbeddingOptions throws on unknown keys rather than silently accepting drift.

Rhetorical-Drift Audit (per guide §7.4):

• PR description: "terminate their locally owned work" — precisely scoped (local mechanism only); residuals table admits remote continuation for all three branches without laundering.
• Deltas section: both declared strengthenings verified in the diff (ordering pin; coalescing bypass with the JSDoc rationale "one caller must not abort another caller's shared child").
• "Existing provider-timeout codes remain compatible" — verified (OPENAI_COMPATIBLE_REQUEST_TIMEOUT and PROVIDER_TIMEOUT paths untouched; the contention classifier's regex contract preserved verbatim per the in-code comment).
• JSDoc: new blocks describe mechanism and residuals without ticket anchors; the queue-disposal and SDK-residual comments are exactly where a future reader needs them.

Findings: Pass.

🧠 Graph Ingestion Notes

• [KB_GAP]: None — the ticket's capability matrix and the PR's residuals table are the documentation this surface needed.
• [TOOLING_GAP]: None.
• [RETROSPECTIVE]: Cancellation has three separable problems and this PR solves each at its own layer: propagation (signal reaches every locally-owned phase), settlement (exactly-once guards plus reject-before-broadcast ordering so no late resolution can rewrite the outcome), and honesty (per-branch residual matrices so "aborted" never claims more than the local mechanism proves). The settled-flag + cleanup-listener pattern repeated across queue/delay/transport is the canonical Neo-owned-lifecycle shape: every listener and timer is removed exactly once by construction, not by convention.

🎯 Close-Target Audit

• Close-targets identified: Resolves #15694 (newline-isolated, PR body)
• #15694 confirmed not epic-labeled (labels: enhancement, ai, testing, architecture, performance)

Findings: Pass.

📑 Contract Completeness Audit

• Originating ticket contains a Contract Ledger matrix (12 rows)
• Implemented diff matches the Ledger: invocation cadence (due-only, canary-only), ownership split, strict inputs, error taxonomy with per-branch codes preserved, queue/in-flight/retry semantics, cleanup exactly-once with the SDK residual admitted, idempotent re-abort, bounded input-free observability, additive versioning

Findings: Pass.

🪜 Evidence Audit

• PR body declares Evidence: L2 → L2 required, no residuals
• Achieved ≥ required: every AC is locally observable and witnessed (queue disposal, in-flight abort, retry/yield cutoff, taxonomy pins, fail-closed consumers) at exact head; CI green
• No evidence-class collapse: Gemini/server-side residuals are admitted unknowns, not upgraded claims

Findings: Pass.

N/A Audits — 📡 🔗

N/A across listed dimensions: no OpenAPI surface; no new workflow convention — the signal/options contract extends an existing service behind its existing public methods, so no cross-skill wiring is required.

🧪 Test-Evidence & Location Audit

• Execution evidence: exact-head required CI green at 9e97ae530d (statusCheckRollup — all checks SUCCESS); author's focused receipts consistent with CI scope
• Reviewer falsifier: N/A — no named behavioral concern. The adversarial settlement races I would have probed (abort-listener resolving a valid vector; provider timeout winning a later caller abort; coalesce poisoning) are each already pinned by a named spec.
• Test location: co-located with the touched seams — canonical; Gemini SDK taxonomy proven in an isolated config process, keeping the SDK's internal listener out of the asserted contract. Structure-map: ran per mandate — no placement question (existing service/config seams; the leaf lives in the canonical configBase).

Findings: Pass.

📋 Required Actions

No required actions — eligible for human merge.

📊 Evaluation Metrics

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

• [ARCH_ALIGNMENT]: 97 — propagation lands at the existing seams with strict additive options, the deadline leaf follows the SSOT leaf pattern exactly, and diagnostics/actuation separation holds everywhere; −3 for the ordering pin living only in specs + PR prose rather than at the two consumer sites.
• [CONTENT_COMPLETENESS]: 95 — every new helper carries precise JSDoc including the residual admissions; the residuals table is the honest shape; −5 for the two Depth Floor documentation notes.
• [EXECUTION_QUALITY]: 96 — exactly-once settle guards throughout, double-gated queue removal, no double-destroy, abort-aware retry delays, fail-closed consumer mapping, and adversarial-race witnesses; CI green at exact head.
• [PRODUCTIVITY]: 100 — all ten ACs carry named witnesses, including the four adversarial/race pins and the per-branch taxonomy compatibilities.
• [IMPACT]: 82 — retires the abandoned-probe class that can stall a shared provider and corrupt recovery cadence; bounded to diagnostics, but those diagnostics gate the self-healing loop.
• [COMPLEXITY]: 76 — three provider branches × five phase boundaries plus two consumers and a config leaf; the surface is wide but each change is the same disciplined pattern repeated.
• [EFFORT_PROFILE]: Heavy Lift — high-blast transport-lifecycle work across three provider adapters, carried with the per-branch honesty the intake demanded.

The abandoned-probe class dies here: a consumer deadline now retires the whole local work tree — queue entry, socket, retry timer, batch yield — and the evidence it leaves behind says exactly which of the three timeout/abort authorities fired. Merge-safe.