The nightly goes green: the LLVM-AOT rail links, the emitter stops leaking, and a PR that closes a nightly-failure issue runs the nightly - #4046

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, mozilla-actions/sccache-action@v0.0.9. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/