fix: update GitHub Actions workflow to use new output syntax

- Replace deprecated ::set-output in validate-links.yml with $GITHUB_OUTPUT
- Update Python script to print JSON to stdout for workflow capture
- Also write to GITHUB_OUTPUT when available for future compatibility
- Fix whitespace linting issue

This completes the migration away from deprecated GitHub Actions syntax
while maintaining backward compatibility with the existing workflow.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: hesreallyhim

.github/workflows/validate-links.yml

@@ -33,7 +33,7 @@ jobs:
       id: validate
       run: |
         make validate-github > validation_results.json
-        echo "::set-output name=has_broken_links::$(python -c "import json; data=json.load(open('validation_results.json')); print('true' if data['broken_links'] else 'false')")"
+        echo "has_broken_links=$(python -c "import json; data=json.load(open('validation_results.json')); print('true' if data['broken_links'] else 'false')")" >> "$GITHUB_OUTPUT"
 
     - name: Upload validation results
       if: always()

scripts/validate_links.py

@@ -416,12 +416,14 @@ def main():
 
         if args.github_action:
             # Output JSON for GitHub Action
+            # Always print the JSON results for capture by the workflow
+            print(json.dumps(results))
+
+            # Also write to GITHUB_OUTPUT if available
             github_output = os.getenv("GITHUB_OUTPUT")
             if github_output:
                 with open(github_output, "a") as f:
                     f.write(f"validation-results={json.dumps(results)}\n")
-            else:
-                print(f"validation-results={json.dumps(results)}")
 
             # Set action failure if broken links found
             if results["newly_broken"] > 0: