refactor: replace trim() helper with native String.prototype.trim()

[remarkablemark]

What is the motivation for this pull request?

Refactor: remove the polyfill-era trim() helper function in favor of the native String.prototype.trim(), which has been universally available since IE9 and Node.js v0.1.

What is the current behavior?

A custom trim() helper wraps str.replace(/^\s+|\s+$/g, '') with a falsy guard, along with a comment referencing the MDN polyfill.

What is the new behavior?

The trim() helper and TRIM_REGEX are removed. Call sites now use str.replace(COMMENT_REGEX, '').trim() directly.

Checklist:

• Conventional Commits
• Tests
• Documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (08faa75) to head (3a56de8).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #557   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          100        97    -3     
  Branches        17        16    -1     
=========================================
- Hits           100        97    -3     

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