fix: watcher leak, registry write races, and stalled scans - #28

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5, github/codeql-action/analyze@0daab03d71ff584ef619d027a3fd9146679c5d84, github/codeql-action/init@0daab03d71ff584ef619d027a3fd9146679c5d84. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/