chore(client): add gdUnit4 test framework addon
Vendor gdUnit4 for Godot 4 client testing (D-030). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Vendor gdUnit4 for Godot 4 client testing (D-030). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>