chore(conformance): widen android G5 budget to 5500ms

Physical-device p95 swung 3209-4612ms across sessions (cold runs right
after a reboot are slower). 4500ms was too tight for that jitter; 5500ms
covers the observed ceiling with headroom.

conformance/gates.sh

@@ -24,7 +24,8 @@
 #   DURATION=3m       per-run fuzz duration
 #   SEED=0            fuzz seed
 #   P95_LIMIT_MS      G5 p95 step-latency ceiling in ms (default 2500 for iOS,
-#                     4500 for the android backend's higher per-step USB cost)
+#                     5500 for the android backend's higher and more variable
+#                     per-step USB cost, especially cold right after a reboot)
 #   SANDERLING=sanderling  binary to invoke
 
 set -euo pipefail
@@ -42,7 +43,7 @@ SEED="${SEED:-0}"
 # the simulator; holding a physical device to it would force ripping out the
 # settle/retry logic the correctness gates depend on. Override with P95_LIMIT_MS.
 if [[ "$BACKEND" == "android" ]]; then
-  P95_LIMIT_MS="${P95_LIMIT_MS:-4500}"
+  P95_LIMIT_MS="${P95_LIMIT_MS:-5500}"
 else
   P95_LIMIT_MS="${P95_LIMIT_MS:-2500}"
 fi