The pack-recovery mirror rung fired on "the pack failed and the staging
output holds no packaged executable". Every failure before electron-builder
is also true of that condition, and no mirror can repair a compile, bundler
or native-link failure — the rung just re-ran the whole pack while printing
that the Electron download from GitHub looked blocked.
The retry now also requires _electron_dist_ok to be false, matching the
gate the re-download rung already used. Late failures are unchanged: a
packaged executable in place still means exactly one attempt (#40187).
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