Keep the auto-updater answering at the path operators registered

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Keep the auto-updater answering at the path operators registeredOperators start the updater with PM2 by naming its path, and PM2 keeps that pathacross restarts. Moving the file would have broken the updater on the very pullthat delivered the move, on machines we do not control, and again on the nextrelease even without a restart.Everything inside the scripts is self-locating and repairs itself on pull, soonly that one registered path had to survive. It is a forwarder now: the realupdater lives with the rest of the validator's scripts, and the old path execsit. Two tests keep it honest, and the guide documents both paths with the pm2commands to move across, so the forwarder can be dropped later.This removes the only operator-facing breakage in the migration.