ci(folio): pin the recalibrated seeds and drop android to a health gate

web 3 and ios 7 convict 3 runs out of 3 with an exactly 2x witness.
android convicts 2 in 5 because the same seed does not walk the same
trajectory there, so it proves the app runs instead.

.github/scripts/folio-run.sh

@@ -5,8 +5,10 @@
 #
 #   SEED=3 MAX_STEPS=240 .github/scripts/folio-run.sh android
 #
-# Every platform expects exit 2: folio's double-submit bug is still there, and a
-# run that no longer finds it is a regression in the fuzzer, not a pass.
+# web and ios expect exit 2: folio's double-submit bug is still there, and a run
+# that no longer finds it is a regression in the fuzzer, not a pass. android is a
+# health gate instead, because a run there is not a function of its seed; see
+# docs/development/ci.md.
 set -uo pipefail
 
 platform="${1:?usage: folio-run.sh android|ios|web}"
@@ -96,6 +98,26 @@ violated=$(grep -ho '"violations":\[[^]]*\]' "$run_dir/trace.jsonl" 2>/dev/null
   [ -n "$violated" ] && echo "- $violated"
 } >> "$summary"
 
+if [ "$platform" = "android" ]; then
+  # A health gate, not a conviction gate. The android hierarchy dump can show
+  # two screens mid-transition, and such a step applies no action, so the same
+  # seed walks a different trajectory each run and the bug turns up in about two
+  # runs in five. Demanding a conviction would cry wolf more often than it would
+  # catch the regression it exists to catch. Reaching the transaction screen is
+  # what this leg proves: the app built, installed, launched and drove.
+  case "$code" in
+    0) ;;
+    2) echo "folio/android: found the submit bug in $steps steps (a bonus, not required)" ;;
+    *) echo "folio/android: the harness failed with exit $code" >&2; exit "$code" ;;
+  esac
+  if ! grep -q '"AddTransactionScreen"' "$run_dir/trace.jsonl"; then
+    echo "folio/android: the run never reached AddTransactionScreen, so it never got past login" >&2
+    exit 1
+  fi
+  echo "folio/android: healthy run over $steps steps, reached the transaction screen"
+  exit 0
+fi
+
 case "$code" in
   2) echo "folio/$platform: found the submit bug in $steps steps"; exit 0 ;;
   0) echo "folio/$platform: the run finished clean; the double-submit bug was NOT found in $steps steps (seed $seed)" >&2; exit 1 ;;