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refactor(logger): Make signal handler registration idempotent

A second enable() without an intervening disable() overwrote every
#signalHandlers map entry with fresh closures, stranding the first set
of handlers on process. #deregisterSignalHandlers() iterates the map, so
it could only detach the latest set, leaking the originals.

Guard #registerSignalHandlers() on the map already being populated and
return early, mirroring how disable() guards on #stopped. Registration
and deregistration happen as a unit, so a single check covers all
signals.

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