Reuse validated FlashInfer cache for pressure probe

runs/frontier-fidelity-envelope-v1/fixed-pd-pressure-matching-card.md

@@ -31,7 +31,9 @@ The probe fixes Qwen3-30B-A3B BF16, community vLLM 0.20.0, H20, TP4, MNS64,
 MBT=8192, chunked prefill, and prefix caching off. It compares per-GPU rates
 `{1, 2, 3, 4}` (global TP4 rates `{4, 8, 12, 16}` request/s). Every rate has
 257 exact `4096 -> 256` requests in each of three fresh-server trials; rate
-orders are rotated across trials.
+orders are rotated across trials. The launcher reuses the validated vLLM 0.20
+FlashInfer kernel cache; this avoids including one-off custom-kernel JIT in
+server startup and does not alter request latency measurement.
 
 ## Decision rule