System Connections — runtime and surface wiring map

From the Meridians Wiki · Public · Maintained · joint

The map lives under diagrams/, one single-purpose file per topic, split into three tracks — [Concept] (what the system is), [Flow] (how work moves), [UI] (what you see). Read the index at diagrams/README.md and pick the diagram you need.

Verified against code. Companion to the generated file map. A quick tour of the tracks:

Concepts — three layers of opinion · the Program loop · platform model.
Flows — access gate · navigation · onboarding · maintenance run · story pipeline · MCP chains · MCP affordance map (generated) · MCP runtime · engine pipeline · scenario loop · cache coherence · hosted sign-in · weekly update.
UI — gateway public surfaces · home console · workspace shell · center views · inspector · constellation · topbar & run surfaces · mobile · scenario UI.