test: add CI-backed verification suite and harden create flow

- add Vitest, coverage, CLI, package, and mutation test commands
- add GitHub Actions verify, mutation, and audit workflows
- document testing policy and contributor commands
- replace curl template download with streamed retryable axios helper
- improve background install exit-code handling and tracker error reasons

package.json

@@ -8,7 +8,15 @@
   "main": "dist/index.js",
   "scripts": {
     "build": "node build.js",
-    "dev": "NODE_ENV=development node build.js",
+    "dev": "node build.js",
+    "lint": "eslint --ext .ts,.mjs bin test tests vitest.config.ts vitest.mutation.config.ts",
+    "typecheck": "tsc --noEmit --project tsconfig.test.json",
+    "test": "vitest run test/unit test/integration test/login-tracking-source.test.mjs tests",
+    "test:coverage": "vitest run --coverage test/unit test/integration test/login-tracking-source.test.mjs tests",
+    "test:cli": "npm run build && vitest run test/cli",
+    "test:pack": "npm run build && vitest run test/pack",
+    "test:mutation": "stryker run",
+    "verify": "npm run lint && npm run typecheck && npm run test && npm run test:coverage && npm run build && npm run test:cli && npm run test:pack",
     "prepublishOnly": "npm run build"
   },
   "bin": {
@@ -17,7 +25,6 @@
   "files": [
     "dist"
   ],
-  
   "keywords": [
     "ipfs",
     "cli",
@@ -49,7 +56,12 @@
     "@rollup/plugin-commonjs": "22.0.2",
     "@rollup/plugin-json": "4.1.0",
     "@rollup/plugin-node-resolve": "14.1.0",
+    "@stryker-mutator/core": "^7.3.0",
+    "@stryker-mutator/vitest-runner": "^7.3.0",
     "@types/adm-zip": "^0.5.8",
+    "@typescript-eslint/eslint-plugin": "^6.21.0",
+    "@typescript-eslint/parser": "^6.21.0",
+    "@vitest/coverage-v8": "^0.34.6",
     "dotenv": "16.5.0",
     "esbuild": "0.25.2",
     "eslint": "8.33.0",
@@ -57,10 +69,16 @@
     "eslint-config-prettier": "8.6.0",
     "eslint-plugin-import": "2.27.5",
     "eslint-plugin-prettier": "4.2.1",
+    "execa": "^7.2.0",
+    "fast-check": "^3.23.2",
+    "nock": "^13.5.6",
     "prettier": "2.8.3",
     "rollup": "2.79.2",
     "rollup-plugin-copy": "3.5.0",
-    "rollup-plugin-terser": "7.0.2"
+    "rollup-plugin-terser": "7.0.2",
+    "tmp-promise": "^3.0.3",
+    "typescript": "^5.4.5",
+    "vitest": "^0.34.6"
   },
   "engines": {
     "node": ">= 16.13.0"