docs-mermaid

Generate precise diagrams (flowchart, sequence, state, ER, class, gantt, gitGraph) using Mermaid for nexus-agents docs. Use when the user wants to "diagram this", "show how X works", "draw the flow", or asks for a flowchart / sequence / state diagram. Cross-references docs-chart (for quantitative data viz) and docs-image (for illustrative AI-gen) so each visual lane has a clear winner.