Replace local matrix_builder.js with @vlsi/github-actions-random-matrix npm package

[vlsi]

Migrate matrix.js to matrix.mjs (ESM), use createGitHubMatrixBuilder() which provides seeded RNG for reproducible CI matrix generation.

Previously, the matrix was randomized on every run, and now every PR would get a own stable seed.

Summary by CodeRabbit

• Chores
  • Refactored CI/CD workflow matrix generation to use modern ECMAScript modules
  • Integrated external npm-based matrix builder package for improved maintainability
  • Added npm dependency management to workflow automation
  • Updated workflow configuration to leverage standardized matrix generation

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1ccc6541-7b18-43ad-9538-fac7e9fe7b09

📥 Commits

Reviewing files that changed from the base of the PR and between 8d167fb and 1ae5193.

⛔ Files ignored due to path filters (1)

• .github/workflows/package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (5)

• .github/workflows/matrix.mjs
• .github/workflows/matrix_builder.js
• .github/workflows/package.json
• .github/workflows/test.yml
• .gitignore

💤 Files with no reviewable changes (1)

• .github/workflows/matrix_builder.js

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📝 Walkthrough

Walkthrough

This refactoring migrates the workflow matrix generation from an internal CommonJS script with embedded matrix building logic to external ES modules, replacing the local MatrixBuilder class with a dependency on @vlsi/github-actions-random-matrix.

Changes

Cohort / File(s)	Summary
Workflow Matrix Refactoring .github/workflows/matrix.mjs, .github/workflows/package.json	Converted matrix generation script to ES modules with import statements and replaced internal MatrixBuilder class usage with external createGitHubMatrixBuilder() from the new dependency. Added package.json declaring @vlsi/github-actions-random-matrix v2.0.0 as a dependency.
Removed Internal Matrix Builder .github/workflows/matrix_builder.js	Deleted entire 255-line file containing Axis and MatrixBuilder classes, as functionality is now provided by the external @vlsi/github-actions-random-matrix package.
CI/CD Configuration .github/workflows/test.yml	Updated matrix preparation step to run matrix.mjs instead of matrix.js and added npm ci --prefix .github/workflows command to install workflow dependencies before matrix generation.
Repository Configuration .gitignore	Added node_modules to ignore list, preventing workflow dependencies from being tracked in version control.

Poem

🐰 Goodbye old builder, your code served us well,
Now external packages handle the spell!
With ES modules and npm ci,
Our workflows are cleaner—hop, skip, and fly! ✨

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and specifically describes the main change: replacing the local matrix_builder.js implementation with an npm package.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[juherr]

Could you add a dependabot entry that will update the package.json in case you release a new version?

[vlsi]

Does dependabot require explicit opt-in? I haven't used it. I know renovate picks up project.json automatically