ebcc8b7ca9
The actions/setup-node@v6.4.0 upgrade stopped auto-shimming yarn onto PATH via corepack. The yarn-plugin test spawns yarn via Node's child_process.spawn() which does a raw PATH lookup, causing ENOENT failures. Adding corepack: true ensures the yarn shim is available. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Fredrik Adelöw <freben@gmail.com>