Revert "chore: workflow - Run link checker on commit message trigger [link-check]"

This reverts commit fa0dd2d.

Author: neural-loop

.github/workflows/main.yml

@@ -143,7 +143,7 @@ jobs:
   link-checker:
     runs-on: ubuntu-latest
     needs: build
-    if: github.event_name == 'pull_request' || contains(github.event.head_commit.message, '[link-check]')
+    if: github.event_name == 'pull_request' # Only run on pull requests
     steps:
       - name: Download artifact
         uses: actions/download-artifact@v4