Module graph 

Graph TUI Visualization Module

Terminal-based graph visualization with Toyota Way principles.

Design Principles (per spec docs/batuta-graph-viz-tui-spec.md)

• Genchi Genbutsu: Graph data at source, no duplication
• Jidoka: Built-in quality via layout convergence tests
• Heijunka: Single layout engine, multiple output backends
• Mieruka: Semantic colors for instant status recognition
• Respect for People: Accessibility via shapes (not just color)

Academic References

• Fruchterman & Reingold (1991) - Force-directed layout
• Kamada & Kawai (1989) - Spring-based layout
• Sugiyama et al. (1981) - Hierarchical DAG layout

Performance Constraints (Muri Prevention)

• Hard limit: 500 nodes maximum for TUI rendering
• Default visible: Top 20 nodes by centrality (Mieruka)

Re-exports

pub use super::graph_layout::LayoutAlgorithm;

pub use super::graph_layout::LayoutConfig;

pub use super::graph_layout::LayoutEngine;

pub use super::graph_analytics::GraphAnalytics;

pub use super::graph_analytics::GraphAnalyticsExt;

pub use super::graph_analytics::COMMUNITY_COLORS;

Structs

Edge

Edge in the graph

Graph

Graph for TUI visualization

GraphRenderer

Graph renderer

Node

Node in the graph

Position

2D position for layout

RenderedGraph

Rendered graph as string buffer

Enums

NodeShape

Node shape for accessibility (Respect for People per peer review #6)

NodeStatus

Node status with accessible visual encoding

RenderMode

Render mode for terminal compatibility

Constants

DEFAULT_VISIBLE_NODES

Default visible nodes (Mieruka per peer review #9)

MAX_TUI_NODES

Maximum nodes for TUI rendering (Muri prevention per peer review #3)