feat: add toolbox contract shell and testkit

packages/testkit/package.json

@@ -0,0 +1,52 @@
+{
+  "name": "@add-ideas/toolbox-testkit",
+  "version": "0.1.0",
+  "description": "Manifest, asset, and nested-deployment smoke checks for built toolbox applications.",
+  "license": "Apache-2.0",
+  "repository": {
+    "type": "git",
+    "url": "git+https://git.add-ideas.de/zemion/toolbox-sdk.git",
+    "directory": "packages/testkit"
+  },
+  "homepage": "https://git.add-ideas.de/zemion/toolbox-sdk",
+  "keywords": [
+    "toolbox",
+    "manifest",
+    "smoke-test",
+    "cli"
+  ],
+  "type": "module",
+  "sideEffects": false,
+  "engines": {
+    "node": ">=20"
+  },
+  "files": [
+    "dist",
+    "README.md",
+    "LICENSE"
+  ],
+  "bin": {
+    "toolbox-check": "./dist/cli.js"
+  },
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "types": "./dist/index.d.ts",
+  "dependencies": {
+    "@add-ideas/toolbox-contract": "0.1.0"
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.build.json && node -e \"const fs=require('node:fs');fs.chmodSync('dist/cli.js',0o755);fs.copyFileSync('../../LICENSE','LICENSE')\"",
+    "clean": "node -e \"require('node:fs').rmSync('dist', { recursive: true, force: true })\"",
+    "prepack": "npm run build",
+    "typecheck": "tsc -p tsconfig.json --noEmit"
+  },
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://git.add-ideas.de/api/packages/zemion/npm/"
+  }
+}