The first real Forgejo CI run failed because the linux-builder runner ships
Node 18.19: scripts using import.meta.dirname threw, and its older npm
reported the mobile lock as out of sync with the file: dependency on
packages/core (the lock is in sync under Node 24's npm).
bootstrap-linux-toolchain.sh gains a checksum-verified `node` mode
(24.19.0, the .nvmrc version); ci.yml (quality, build-validation,
mobile-quality) and deploy-site.yml add it to GITHUB_PATH before npm runs.
