chore: update .gitignore and package.json for testing improvements

Author: barelyhuman

.gitignore

@@ -1,4 +1,6 @@
 dist
 node_modules
 .DS_Store
-package-lock.json
+package-lock.json
+
+coverage

adex/package.json

@@ -64,7 +64,8 @@
   ],
   "scripts": {
     "next": "bumpp",
-    "test": "glob -c 'node --test --test-reporter=spec' tests/**/*.spec.js"
+    "test": "glob -c 'node --test --test-reporter=spec' tests/**/*.spec.js",
+    "test:ci": "c8 pnpm test"
   },
   "dependencies": {
     "@barelyhuman/tiny-use": "^0.0.2",
@@ -87,6 +88,7 @@
     "@types/node": "^20.14.10",
     "adex-adapter-node": "^0.0.17",
     "autoprefixer": "^10.4.19",
+    "c8": "^10.1.3",
     "glob": "^11.0.1",
     "kolorist": "^1.8.0",
     "tailwindcss": "^3.4.4",