These diagrams are the relationship layer above the generated catalogs. Use them to navigate package topology, capability seams, event flow, model-facing tools, app composition, and runtime lifecycle paths. Exact signatures and type shapes still live in the [subsystem pages](subsystems/core.md) (types + the generated `cordis-surface` regions) and [tool-catalog.md](tool-catalog.md).
The process decision behind this index is recorded in [the documentation graph Agent Note](../.agents/notes/archived/process/2026-07-03-documentation-graph-atlas.md).