emrg: promote task browser-first probing + keep host-action tabs open (rants 2026-08-19T21:05:34 + 21:08:55) - #899

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: astral-sh/setup-uv@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/