Add ability to save graphviz automatically

[ConnorStoneAstro]

No description provided.

[Copilot]

Pull Request Overview

This PR adds an automatic save feature for Graphviz representations by updating the Node.graphviz method and the associated tests.

• Updates the graphviz API by adding an optional saveto parameter to trigger file writing.
• Adds tests to verify that a saved Graphviz file exists and is removed after testing.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
tests/test_base.py	Adds a test case to verify Graphviz file creation and cleanup.
src/caskade/base.py	Extends the graphviz method with an optional saveto parameter to render and save the graph.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (eb5e478) to head (cf720bc).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #41   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files           11        11           
  Lines         1236      1240    +4     
=========================================
+ Hits          1236      1240    +4     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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