1213/1214 success; matched migrations (4 common) improved -2.6 to -7.2s, scaling with prefill hidden behind transfer. Trace-level TTFT p90 -6% / p99 -5% (modest: migrations are 2% of reqs and partly queue-bound). Confirms layer-wise removes the transfer half of migration overhead but not the control-plane/queue residual. DESIGN.md updated with results. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>