architecture

• One question per diagram: who plays, how the app is built, online rooms on Firebase, what it relies on.
• The backend diagram is online rooms only. A game on one phone never touches the network, so it does not appear there.
• The diagrams are generated: edit the .json in architecture/, then run archify finalize architecture <name>.json <name>.html --quality showcase there. Never hand-edit the .html.
• Cost: about $8 a month, all of it the Apple developer fee. Firebase, RevenueCat and EAS stay inside their free tiers at this size.
• Architecture is canon's, not the design set's. Why each part of the stack was chosen is in the product's own CLAUDE.md.