switch to use dotviz json format

[IvanGoncharov]

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

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[Copilot]

Pull request overview

This PR refactors the GraphQL Voyager graph generation to use the dotviz library's JSON format instead of manually building DOT language strings. The main benefit is improved type safety and maintainability by leveraging dotviz's structured Graph, Node, and Edge types.

• Refactored getDot() to return a structured Graph object instead of a DOT format string
• Migrated from string concatenation to building typed nodes and edges arrays
• Updated graphviz-worker to handle the AggregateError constructor

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/graph/dot.ts	Complete refactoring from string-based DOT generation to structured Graph object using dotviz types, with extracted helper functions for field labels
src/graph/svg-renderer.ts	Added debugging code to render and log the raw DOT format output alongside SVG rendering
src/graph/graphviz-worker.ts	Updated AggregateError constructor call (though with an error in the implementation)
cspell.yml	Added 'tailport' to the dictionary for the new dotviz terminology

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