When neither a prebuild nor a compiled build/Release/*.node is found for
the target platform-arch, stage-native-deps.mjs now runs
electron-rebuild -f -w node-pty to compile one from source before
re-copying build/Release into the staged dist.
This makes the staging script self-sufficient — it always produces a
working native binary dir regardless of whether npm ci --ignore-scripts
skipped postinstall or whether node-pty publishes prebuilds for the
target (e.g. linux-x64 has no prebuild).
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