Q-PI-06: Multiple Console Clients → Pi Concurrency

Can a single Pi 4 serve LangGraph state to three simultaneous console clients (RG40XXV + Wii + PS2)? What are the concurrency limits on checkpointer reads/writes? - Source: [[langgraph-game-surface]] - Depends on: Q-PI-05

Q-PI-07: Model Key Routing for Multi-Unit Sessions

When multiple units run simultaneously (harvesters + active units), how are API keys routed per-unit/per-model without collision? Can the existing secrets/model.env pattern handle per-unit model switching? - Source: [[langgraph-unit-node-interaction-model]] - Depends on: Q-PI-03

Layer 2: Game — Assets, UX/UI, Engine

The player-facing layer. What the game IS.