Add files via upload

tools/build.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# build.sh — build the Kali+ arsenal image, then validate it with the existing presence smoke.
+# Usage: bash tools/build.sh [IMAGE_TAG]   (default: cybench-tools:latest)
+set -euo pipefail
+cd "$(dirname "$0")"
+
+IMAGE="${1:-cybench-tools:latest}"
+
+if ! command -v docker >/dev/null 2>&1; then
+  echo "docker not found — install Docker Desktop / engine first."; exit 1
+fi
+
+echo "Building $IMAGE (linux/amd64) — this is heavy (~minutes, multi-GB)…"
+docker build --platform linux/amd64 -t "$IMAGE" .
+
+echo
+echo "Validating with the presence smoke (scripts/check-tools-image.sh)…"
+bash ../scripts/check-tools-image.sh "$IMAGE"
+
+echo
+echo "Done. Point the hunter at it:  node scripts/cybench-bench.mjs --tools-image $IMAGE --arsenal-tools all …"