Charles P. Cross 77d8a995e8 feat(graph): use subgraph to display dependency counts ...

Restore the subgraph parameter in renderGraph (previously marked as
unused with _) and use it to display meaningful dependency information:

- Add computeDependencyCounts() to calculate blocks/blocked-by counts
- Add renderNodeBoxWithDeps() to render nodes with dependency info
- Show "blocks:N" when an issue blocks N other issues
- Show "needs:N" when an issue depends on N other issues
- Add dependency summary showing total blocking relationships

This makes the graph visualization more informative by showing how
issues relate to each other in the dependency chain.

Tests added:
- TestComputeDependencyCounts: verifies dependency counting logic
- TestRenderNodeBoxWithDeps: verifies box rendering with dep info

Co-authored-by: Charles P. Cross <cpdata@users.noreply.github.com>

2025-12-18 20:35:00 -08:00

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