Move websocket internal events to channels, misc fixes (#318)

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Retention days cannot be greater than the maximum allowed retention set within the repository. Using 3 instead.

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