Layer 5 — Clients

Visualization and interaction surfaces: web app, mobile app, desktop app, CLI, AI agents (MCP, A2A, …), and partner integrations (Slack, EDI, accounting, BI, …). All clients consume the same public API — no privileged path to lower layers — and the architecture treats first-party and third-party clients identically.

Per-client design notes (web app, mobile, AI agents, partner integrations, …) will live under this section.