Add dad-joke-greeter trigger

[markarranz]

Summary

• Fetches a random dad joke from icanhazdadjoke.com and speaks it aloud via macOS say when someone joins your Tuple room
• Routes audio to both local speakers and BlackHole 2ch so remote participants hear the joke through Tuple
• Tracks room presence via room-joined / room-left so jokes only fire while you're in a room
• Includes an interactive setup.sh that validates prerequisites (jq, BlackHole, aggregate audio device) and guides users through the one-time audio configuration
• Optional ~/.tuple/tracked-rooms file to limit jokes to specific rooms

Files

File	Purpose
config.json	Trigger metadata
room-joined	Main trigger — room guard, optional room filter, joke fetch + dual audio output
room-left	Clears room state when you leave
setup.sh	Interactive setup — prerequisite checks, mic selection, aggregate device walkthrough, API test
README.md	Quick setup via script, full manual audio instructions, configuration docs
assets/icon.png	512x512 trigger icon

[github-actions]

Thanks for your contribution, @markarranz! 🎉

We've done some automated sense checks on your trigger, dad-joke-greeter. All looks great! Someone from Tuple will now manually review your trigger's code and get back to you.