UI (Essential): Topology Viewer + Violation Highlighting (Deterministic)

[szverev]

Summary

Implement topology visualization for canonical graph.json and highlight violations using canonical validator output.

Why this is essential

Topology visualization is the core showcase: users must be able to see what they are governing.

Requirements

• Input must be canonical graph.json matching graph.schema.json:
  • Only version, nodes, edges
• Deterministic rendering:
  • stable node ordering
  • stable edge ordering
  • stable layout approach (documented)
• Highlight rule violations:
  • use errors[].location.pointer like /edges/1 to map to edges

Acceptance Criteria

• Given trood-ontop/demo/graph.json, render nodes and edges
• Given output from running trood-ontop/demo/run.sh, highlight the violating edge deterministically