ci(workflow): add build verification step

[SpiGAndromeda]

Summary

This pull request adds a build verification step to the CI workflow to ensure that distribution files are generated correctly.

This prevents releases with missing build artifacts.

Changes

• Added a build action after tests to verify the existence of dist/index.js.
• Added display of bundle size for monitoring purposes.
• CI will now fail if required distribution files are missing.

🤖 Generated with Claude Code

[github-actions]

🤖 AI Validation Results

Status: ⚠️ Passed with Warnings

Your contribution looks good, but consider these suggestions for improvement.

📋 Issues Found:

• Commit messages could be more specific and descriptive.
• The PR description could benefit from a Motivation and How it works section.

⚠️ Suggested Improvements:

📝 Suggested PR Title:

ci(workflow): Add build verification step

📋 Suggested Commit Message:

ci(workflow): Add build verification step to CI workflow

- Add build action to verify `dist/index.js`
- Display bundle size for monitoring
- Fail CI if required distribution files are missing

📄 Suggested PR Description:

## Summary

This pull request adds a build verification step to the CI workflow to ensure that distribution files are generated correctly. This prevents releases with missing build artifacts.

## Changes

- Added a build action after tests to verify the existence of `dist/index.js`.
- Added display of bundle size for monitoring purposes.
- CI will now fail if required distribution files are missing.

## Motivation

[Why was this change necessary?]

## How it works

[Describe the implementation details]

---

Automated validation based on contribution guidelines
Last updated: 2025-08-23 13:39:26 UTC

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.33%. Comparing base (b9bd9b0) to head (59856a0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #7   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files           4        4           
  Lines         542      542           
  Branches      120      120           
=======================================
  Hits          533      533           
  Misses          6        6           
  Partials        3        3           

Flag	Coverage Δ
unittests	98.33% <ø> (ø)

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