Fix #176: Remove unused ext-dom dependency

[samdark]

Q	A
Is bugfix?	yes
New feature?	no
Breaks BC?	no
Fixed issues

• Remove the unused ext-dom runtime requirement.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.18%. Comparing base (73428a0) to head (4efdaad).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #176   +/-   ##
=========================================
  Coverage     87.18%   87.18%           
  Complexity      225      225           
=========================================
  Files            19       19           
  Lines           710      710           
=========================================
  Hits            619      619           
  Misses           91       91           

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[Copilot]

Pull request overview

This PR removes an unused runtime dependency on the PHP ext-dom extension, updates documented requirements accordingly, and adds a regression test to prevent reintroducing the dependency.

Changes:

• Remove ext-dom from composer.json runtime requirements.
• Update README requirements to no longer list the DOM extension.
• Add a PHPUnit regression test asserting ext-dom is not present in Composer runtime requirements.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
composer.json	Drops ext-dom from runtime require.
README.md	Updates the “Requirements” section to match Composer requirements.
tests/ComposerRequirementsTest.php	Adds a test ensuring ext-dom is not reintroduced as a runtime requirement.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.