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Synthesized 4 parallel research efforts into comprehensive SUMMARY.md: - STACK.md: Vanilla Canvas 2D, fixed timestep, Web Audio, no dependencies - FEATURES.md: MVP features + v1.x enhancements + defer list - ARCHITECTURE.md: Game loop + state machine + entity patterns, 10-phase build order - PITFALLS.md: 8 critical pitfalls with prevention strategies Key recommendations: - Use fixed timestep accumulator (60 Hz physics, variable rendering) - Implement 10 phases from game loop foundation to cross-browser testing - Address critical pitfalls early (tunneling, timing, DPI, autoplay, AI, power-ups, lag, memory) - MVP ships with core Pong + AI + menus + basic polish - v1.x adds particles, trails, power-ups, arenas All research backed by official sources (MDN, web.dev, Chrome docs) and established patterns. Confidence: HIGH. Ready for requirements definition. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>