refactor(client): constructor-injectable config, lazy settings, single close path - #54

Node.js ***0 is deprecated. The following actions target Node.js ***0 but are being forced to run on Node.js ***4: actions/checkout@v4, astral-sh/setup-uv@v6. For more information see: https://github.blog/changelog/***0***5-09-19-deprecation-of-node-***0-on-github-actions-runners/