Add v1.0.1: update Node.js 20→22 LTS and Electron 39→42
Node.js 20 reached EOL April 2026; bumps nodesource setup to 22.x. Electron pin updated from ^39.2.4 to ^42.0.0 (current stable). https://claude.ai/code/session_0143uHgfTvF3Pv1oDinkhJRX
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