Supersedes #1250, whose 22 -> 26 bump failed the image build: `corepack enable`
exits 127 because Node 25 unbundled Corepack.
Both stages move to node:24-alpine, the current LTS line — Node 26 stays
Current until October 2026, which is the wrong target for a self-hosted runtime
image. pnpm is installed globally at the exact `packageManager` version, with
the `+sha512...` suffix stripped, so the next base-image major is a one-line
change instead of a broken build.
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