Document PushService, GetCurrentPushProvider, NotificationCleaner and
NotificationBitmapLoader along with their members, and add the missing @param
entries across the notification interfaces.
The NotificationCleaner docs record the behaviour shared by all its methods,
which is not visible in the signatures: each one also removes the grouping
summary notification once it has no children left.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Benoit Marty
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