capabilities: the broker answers a harness's initialize asking another MCP version with its own 2025-06-18, as MCP's version negotiation says (decision 0065 slice two, U9b1c) - #940

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11d5960a326750d5838078e36cf38b85af677262. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/