feat: add CLI for binary management (Python + JavaScript)

Adds install, info, update, and clear-cache subcommands with visible
download progress. Python: `python -m cloakbrowser install`. JavaScript:
`npx cloakbrowser install`. Useful for Dockerfiles where silent
first-use downloads are hard to debug. Closes #43.

js/package.json

@@ -15,6 +15,9 @@
       "import": "./dist/puppeteer.js"
     }
   },
+  "bin": {
+    "cloakbrowser": "./dist/cli.js"
+  },
   "files": [
     "dist"
   ],