Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744, arduino/setup-protoc@a8b67ba40b37d35169e222f3bb352603327985b6. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

function `make_stub_inner` is never used

unused imports: `env` and `io`

function `assert_all` is never used