Add diagnostic expect message for test unwrap in src/api/mod.rs - #950

buildx failed with: failed to build: failed to solve: process "/bin/sh -c cargo build --release --locked" did not complete successfully: exit code: 101

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, docker/setup-buildx-action@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/