Summary

• render edges for raw Cypher visualizations when queries explicitly return relationships
• support both explicit RETURN a, r, b results and Kuzu path objects from RETURN p
• normalize Kuzu element ids into stable vis-network ids so nodes and edges connect correctly

Problem

cgc query --visual was rendering nodes but silently dropping edges for read-only graph queries.

Two common forms were affected:

• MATCH (a)-[r]->(b) RETURN a, r, b LIMIT 50 --visual
• MATCH p=(a)-[r]->(b) RETURN p LIMIT 50 --visual

The CLI help advertises this workflow, but the visualizer only converted returned dict/list values into nodes. It never converted returned relationship objects into edgesData, and path objects were treated as one opaque node with _nodes/_rels inside the tooltip.

Fix

This patch updates visualize_cypher_results(...) to:

• unpack Kuzu path objects with _nodes and _rels
• recognize explicit relationship dicts with _src / _dst
• emit vis-network edges with from, to, label, and arrows
• normalize Kuzu ids like {table, offset} into stable string ids so node/edge references match

The existing guardrail remains in place: we still do not infer edges when the query returns unrelated nodes without explicit relationships.

Verification

• python3 -m py_compile src/codegraphcontext/cli/visualizer.py
• locally verified that generated visualization HTML now contains non-empty edgesData for:
  • MATCH (a)-[r]->(b) RETURN a, r, b LIMIT 2
  • MATCH p=(a)-[r]->(b) RETURN p LIMIT 2