Rendezvous/docs/architecture

Rendezvous architecture decisions

These records define the v1 architecture baseline. A later change to a ratified decision requires a superseding ADR and corresponding contract/test updates.

• ADR 0001: v1 control-plane boundaries and domain
• ADR 0002: publisher trust, discovery, compatibility, and fallback
• ADR 0003: state, privacy, availability, and safety budgets
• Threat model
• Security promise and test matrix

These decisions intentionally leave gameplay authority, player identity, simulation, persistence, social features, skill matchmaking, and gameplay traffic with each game. Relay is future evidence-driven scope, not part of v1.