Steve Yegge 3d8cf15418 fix(graph): pass subgraph to renderGraph to fix nil pointer crash ...

The renderGraph function was being called with nil instead of the
loaded subgraph, causing a nil pointer dereference in
computeDependencyCounts when iterating over subgraph.Dependencies.

Changes:
- Pass subgraph variable to renderGraph instead of nil
- Add defensive nil check in computeDependencyCounts
- Add test case for nil subgraph handling

Fixes GH#657

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-20 01:59:31 -08:00

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