docs: correct ts-jest description — version bump, not new addition

[Copilot]

Description

PR #574 description stated "Adds ts-jest" but ts-jest was already present at ^29.1.2. The change was a version bump (^29.1.2 → ^29.4.6), alongside jest-util (^30.2.0 → ^30.3.0) and @types/jest (^29.5.12 → ^29.5.14).

Adds a clarifying comment to jest.config.js to document the purpose of the ts-jest preset:

// ts-jest preset provides TypeScript compilation support for jest ^29 tests
module.exports = {
  preset: 'ts-jest',
  ...
};

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🎨 Code style update (formatting, renaming)
• ♻️ Refactoring (no functional changes)
• ⚡ Performance improvement
• ✅ Test update

Related Issue

Testing Done

• Tested locally
• Added/updated tests
• All tests passing

Screenshots (if applicable)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Co-Authors

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Summary by cubic

Clarifies jest.config.js with a comment that ts-jest provides TypeScript compilation for Jest 29, and notes it was bumped from ^29.1.2 to ^29.4.6 to align with jest ^29.7.0, not newly added. No functional changes.

^{Written for commit 9715080. Summary will update on new commits.}