PR Review Summary

Status: Approve+Follow-Up

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back (cycle-1 premise pre-flight: no premise-invalid / not-graduated / bypassed / anti-pattern / misalignment / better-substrate / stale-source trigger — not Drop+Supersede):

• Decision: Approve+Follow-Up
• Rationale: Clean, privacy-safe diagnostic instrumentation that enables the #13994 400k-overflow investigation — correct and well-tested. Approve, not Request Changes, because the instrumentation + no-bleed test are right and the live-repro-as-post-merge framing is defensible per #13994's own classification. Follow-Up covers the close-target residual + a contract-consistency check.

Peer-Review Opening: Thanks — the hash-prefix-only fingerprint is exactly the right shape: it correlates one Neo request to one provider counter without leaking session payloads, and the no-bleed test makes that a guarantee rather than a hope.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: the full diff, #13994 (investigate-400k + its "boardless unless post-merge validation reproduces the symptom" classification), your "first slice" lane-claim, the SemanticGraphExtractor tri-vector diagnostics path, rem-state-model.md, and the spec.
• Expected Solution Shape: bounded per-request fingerprints (NO payload logging) to correlate Neo↔provider counters + surface cross-session/repair-loop contamination; a no-bleed test; doc the diagnostic surface.
• Patch Verdict: Matches. buildTriVectorRequestFingerprints (index/role/bytes/tokensEstimate/contentSha256Prefix[16 hex], no payload) wired into the active-call snapshot; rem-state-model.md documents the shape + intent; the test proves sequential calls fingerprint independently with no prior-session payload in either the messages or the fingerprint JSON.
• Premise Coherence: Coheres with verify-before-assert (instrument to investigate) and the capability-security posture — the hash-prefix-only design keeps session content out of the diagnostic surface.

🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #13994
• Related Graph Nodes: #13984 / #13986 (the single-call bounding this complements), #13999, REM Tri-Vector, active-call diagnostics

🔬 Depth Floor

Challenge: the no-bleed test proves isolation in the mocked OpenAiCompatible.generate path. The live 400k symptom (#13994's actual concern) most plausibly stems from repair-loop message growth or provider-side KV/context reuse — paths the mock doesn't exercise. The fingerprints WILL surface those live (growing message-slots / bytes across retries), which is the point — but this PR characterizes test-path no-bleed, not the live root-cause. Non-blocking; it's the post-merge investigation (hence the close-target note).

Rhetorical-Drift Audit: the doc + JSDoc frame this precisely as a correlation diagnostic, not a fix; no overshoot. Findings: Pass.

🧠 Graph Ingestion Notes

• [KB_GAP]: None — correct use of the existing active-call diagnostics + bytesToTokens primitive.
• [TOOLING_GAP]: None observed.
• [RETROSPECTIVE]: Per-request hash-prefix fingerprints are a reusable pattern for payload-safe provider↔Neo correlation — applicable beyond REM to any provider call where an operator must attribute a counter without logging content.

🎯 Close-Target Audit

• Close-target: #13994 (not epic-labeled).
• Finding (Follow-Up): #13994 is an investigation ("investigate the 400k counter overflow"); this PR delivers the instrumentation + a mocked-path no-bleed finding, not the concluded live 400k root-cause. Resolves #13994 is defensible IF the deliverable is the instrumentation+characterization (live-repro post-merge per #13994's own classification) — but ensure the Post-Merge Validation explicitly carries the live 400k-counter correlation as the residual, so closing doesn't orphan the operator symptom. If the live root-cause is in-scope, prefer Refs + a follow-up slice. (Mirrors the close-target care raised on #14044.)

📑 Contract Completeness Audit

• The active-call diagnostic snapshot gains requestMessageCount + requestMessageFingerprints[] — a consumed (operator-read, NEO_REM_RUN_STATE_DIR) surface, documented in rem-state-model.md (good).
• Consistency note (Follow-Up): the contract-ledger discipline applied to #14048/#14053 (new exported/consumed surfaces get a ticket Contract Ledger matrix) — does it extend here? The rem-state-model.md doc may suffice for a gitignored operator-diagnostic (vs a code-consumed function return), but flagging for parity.

Findings: Documented in-repo; ledger-matrix parity is the open consistency question.

🪜 Evidence Audit

Findings: L2 (unit) covers the instrumentation + the cross-session no-bleed; the live 400k characterization is explicitly post-merge per #13994's classification. CI was pending at review time (note, not a finding).

📡 MCP-Tool-Description Budget Audit

Findings: N/A — the PR touches no ai/mcp/server/*/openapi.yaml surface.

🔗 Cross-Skill Integration Audit

• Touches learn/agentos/rem-state-model.md (a reference doc) — updated in-PR to document the new diagnostic fields; no skill predecessor-step or MCP tool added.

Findings: No integration gaps — the reference doc is updated alongside the surface it describes.

🧪 Test-Execution & Location Audit

• Canonical Location: test/playwright/unit/ai/services/graph/SemanticGraphExtractor.spec.mjs — correct.
• Branch NOT checked out locally — reviewed via the diff; CI pending at review time.

Findings: Spec in the canonical tree; the no-bleed assertion (needle absent from both the next call's messages AND the fingerprint JSON) is a strong privacy guarantee.

📋 Required Actions

To proceed with merging, please address:

• Close-target: ensure #13994's Post-Merge Validation explicitly carries the live 400k-counter correlation as the residual (so Resolves #13994 doesn't orphan the live symptom) — or switch to Refs + a follow-up slice if the live root-cause is in-scope.
• Contract consistency: decide whether the diagnostic-snapshot's new fields warrant a #13994 Contract Ledger matrix (parity with #14048/#14053) or whether the rem-state-model.md doc suffices for an operator-diagnostic surface.

(Both are metadata/framing items — the code + test are sound.)

📊 Evaluation Metrics

• [ARCH_ALIGNMENT]: 88 - Right diagnostic primitive, privacy-safe by construction, sits cleanly in the existing active-call snapshot.
• [CONTENT_COMPLETENESS]: 82 - Instrumentation complete; deduction is the close-target/live-residual framing.
• [EXECUTION_QUALITY]: 88 - Bounded fingerprints + a strong no-bleed test (payload-absence asserted twice).
• [PRODUCTIVITY]: 85 - Tight first slice that unblocks the live investigation.
• [IMPACT]: 80 - Turns the 400k overflow from un-correlatable to per-request-attributable, payload-safe.
• [COMPLEXITY]: 35 - Small additive surface; the care is in the privacy boundary + the no-bleed proof.
• [EFFORT_PROFILE]: Quick Win - Focused diagnostic instrumentation.

Solid first slice — approving; just pin the live-400k residual on #13994 so the investigation's actual symptom stays tracked past this merge.

Reviewed by Vega (Claude Opus 4.8).