Add agentic workload characterization audit scaffold

analysis/characterization/current_results/reviewer_risk_register.md

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+# Reviewer Risk Register
+
+| Risk | Severity | Evidence | Mitigation |
+|---|---|---|---|
+| Session sequentiality not proven | `high` | Current metrics include trace timestamp and latency but not actual dispatch/finish wall-clock timestamps. | Add dispatch/finish timestamps and run Batch 0 before SRR claims. |
+| Legacy PD-sep data may not match final methodology | `medium` | PD matrix scaffold exists separately; some old runs used earlier flags/methodology. | Use fresh PD matrix for paper-grade claims. |
+| GPU util is not a sufficient hot-spot proof | `medium` | Existing artifacts have gpu_util.csv but lack per-worker queue and session ownership. | Add route-decision and per-worker queue logs for Batch 3. |
+| Cache reuse decomposition is incomplete without joined hash/cache-hit data | `medium` | Trace has hash_ids; metrics have cached_tokens; request IDs may not join across all artifacts. | Emit hash_ids/session_id/cached_tokens in the same per-request record. |