[Fix] (IntegrationTest): give Split entries private diagnostic logs

scripts/ci/testdata/split_private_log_smoke.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# Exercise the production control, including the private-file read (ID-53 / R-16).
+set -euo pipefail
+HERE="$(cd "$(dirname "$0")/.." && pwd)"
+WORK=$(mktemp -d "${TMPDIR:-/tmp}/split-private-log.XXXXXX")
+trap 'rm -rf "${WORK}"' EXIT
+cp "${HERE}/testdata/stub_ctest.sh" "${WORK}/ctest"
+chmod +x "${WORK}/ctest"
+passes=0
+for mode in missing-fatal stdout-fatal stale-fatal evidence e3-unrelated; do
+  mkdir -p "${WORK}/${mode}"
+  rc=0
+  STUB_MODE="${mode}" CTEST="${WORK}/ctest" CONTROL_TMPDIR="${WORK}/${mode}" \
+    bash "${HERE}/split_negative_controls.sh" > "${WORK}/${mode}.out" 2>&1 || rc=$?
+  if [ "${mode}" = evidence ]; then
+    [ "${rc}" = 0 ] && grep -q "negative control E3(a).*scenario's own diagnostic" "${WORK}/${mode}.out" || {
+      cat "${WORK}/${mode}.out"; echo "NOT OK private-file Fatal must PASS"; exit 1;
+    }
+  else
+    message='E1 FAILED: selected private logs lack expected Fatal'
+    [ "${mode}" != e3-unrelated ] || message='FAILED: red lacks its persistent-map push diagnostic'
+    [ "${rc}" != 0 ] && grep -q "${message}" "${WORK}/${mode}.out" || {
+      cat "${WORK}/${mode}.out"; echo "NOT OK ${mode}: control must report FAILED for its own reason"; exit 1;
+    }
+  fi
+  echo "ok private-log ${mode} (control rc=${rc})"
+  passes=$((passes + 1))
+done
+echo "private-log smoke test: ${passes} passed, 0 failed"