[squad:plan] Mothkeeper design and architecture (Keaton) #65310

Define the game design doc and technical architecture.

• Swarm rules: attraction, fear of shadow, hazard response
• Level data format (JSON) and loader
• Scoring: moths saved thresholds per room
• Module layout: sim, render, input, audio, save
• Scope guardrails for MVP

Done when: design doc and architecture notes are reviewed and M1 is unblocked.

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• expires on Oct 4, 2026, 5:26 AM UTC-08:00