chore: remove unused cross-env dependency

[noritaka1166]

Summary

Removes the unused cross-env development dependency and its orphaned transitive dependency from package-lock.json.

cross-env was added for the previous nyc-based coverage command in a01f01b. The coverage workflow was later migrated to c8 in 47fc332, which removed the only usage of cross-env while leaving the dependency declaration behind.

No related issue; this is dependency cleanup.

What kind of change does this PR introduce?

chore

Did you add tests for your changes?

No. This change only removes unused dependency metadata and does not alter runtime behavior.

Validated that cross-env and its orphaned transitive dependency are absent from both the manifest and lockfile.

Does this PR introduce a breaking change?

No.

If relevant, what needs to be documented once your changes are merged or what have you already documented?

No documentation changes are needed.

Use of AI

Yes. I used Codex to audit dependency usage, inspect the Git history, identify the obsolete dependency and its orphaned transitive dependency, and validate the manifest and lockfile changes. I reviewed the resulting changes.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8eb42b3

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.30%. Comparing base (207f821) to head (8eb42b3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4810   +/-   ##
=======================================
  Coverage   93.30%   93.30%           
=======================================
  Files          14       14           
  Lines        5466     5466           
  Branches      793      793           
=======================================
  Hits         5100     5100           
  Misses        364      364           
  Partials        2        2           

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