perf: share verified blobs and expose bounded cache metrics

docs/cache-performance-optimized-summary.json

@@ -0,0 +1,51 @@
+{
+  "scope": "Compiled local loopback changed-text gzip responses; repeated optimized measurements ran after all other task benchmarks/tests ended. The full optimized run overlapped the metadata benchmark during its early scenarios. Shared host, synthetic workload; no production capacity claim.",
+  "verifiedOptimizedResponses": 2500,
+  "rows": [
+    {
+      "bytes": 16384,
+      "before": {
+        "serialP50Ms": 44.88915300000008,
+        "concurrency8P95Ms": 462.1094459999995
+      },
+      "optimized": {
+        "serialP50Ms": 8.908395999999811,
+        "concurrency8P95Ms": 111.85025099999984
+      },
+      "repeat": {
+        "serialP50Ms": 7.257277000000158,
+        "concurrency8P95Ms": 114.94514900000013
+      }
+    },
+    {
+      "bytes": 262144,
+      "before": {
+        "serialP50Ms": 45.89932399999998,
+        "concurrency8P95Ms": 444.0948499999995
+      },
+      "optimized": {
+        "serialP50Ms": 9.481284999999843,
+        "concurrency8P95Ms": 136.36852099999942
+      },
+      "repeat": {
+        "serialP50Ms": 9.021533999999974,
+        "concurrency8P95Ms": 107.61299899999995
+      }
+    },
+    {
+      "bytes": 2097152,
+      "before": {
+        "serialP50Ms": 60.49789199999941,
+        "concurrency8P95Ms": 528.2149260000006
+      },
+      "optimized": {
+        "serialP50Ms": 24.991613999999572,
+        "concurrency8P95Ms": 177.60703299999932
+      },
+      "repeat": {
+        "serialP50Ms": 19.012864000000263,
+        "concurrency8P95Ms": 216.19974999999977
+      }
+    }
+  ]
+}