Visualize Semantic Model

Render a dark-themed directed graph of a Cube.dev model by parsing cube YAML files, detecting the fact spine, then invoking the bundled renderer with a JSON spec.

The renderer (scripts/render_graph.py) is pure layout + drawing — it takes a graph spec on stdin and writes the PNG. Keeping it bundled means every run produces visually consistent output and you don't reinvent matplotlib code each time.

Step 1: Resolve the cubes folder

If the user passed a folder argument, use it. Otherwise default to cubes/. If the folder doesn't exist, ask the user where the cube definitions live before proceeding.

find <folder> -name "*.yml" -not -name "model-graph.*" | sort