ci: add workflow to check dist/index.js is up to date

[MathurAditya724]

Summary

• Adds a new check-dist CI workflow that rebuilds dist/index.js from source and fails if the committed version doesn't match
• Ensures PRs cannot be merged with a stale dist/index.js

How it works

1. Checks out the PR, installs deps, runs pnpm run build
2. Compares the freshly built dist/index.js against the committed version using git diff
3. If they differ, the check fails with an error message instructing the developer to run pnpm run build and commit the result
4. Shows git diff --stat output so the developer can see exactly what changed

[github-actions]

Codecov Results 📊

✅ 179 passed | Total: 179 | Pass Rate: 100% | Execution Time: 259ms

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ No test changes detected

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 757 uncovered lines.
✅ Project coverage is 55.94%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    55.94%    55.94%        —%
==========================================
  Files           24        24         —
  Lines         1713      1713         —
  Branches      1232      1232         —
==========================================
+ Hits           956       956         —
- Misses         757       757         —
- Partials        97        97         —

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Generated by Codecov Action