Fix YAML syntax error in config-sync-check workflow

Changed from quoted heredoc (<< 'EOFMARKER') to unquoted heredoc
(<< EOFMARKER) to allow both bash variable expansion (${VAR}) and
GitHub Actions expression evaluation (${{ }}). This matches the
pattern used in cost-estimate.yml.

The quoted heredoc was preventing GitHub Actions expressions from
being evaluated, causing YAML syntax errors when the workflow tried
to parse the unevaluated template syntax.

Also simplified by removing unnecessary sed placeholder replacements,
using direct variable substitution instead.

Author: claude

.github/workflows/config-sync-check.yml

@@ -85,38 +85,26 @@ jobs:
           # Read the detailed output
           DETAILED_OUTPUT=$(cat /tmp/sync-check-output.txt)
 
-          # Escape special characters for markdown
-          DETAILED_OUTPUT_ESCAPED=$(echo "$DETAILED_OUTPUT" | sed 's/\\/\\\\/g' | sed 's/`/\\`/g')
-
-          # Create markdown report
-          cat > /tmp/sync-report.md << 'EOFMARKER'
+          # Create markdown report using unquoted heredoc for variable expansion
+          cat > /tmp/sync-report.md << EOFMARKER
 ## 🔄 Configuration Sync Check
 
-> **Analysis based on commit:** [`COMMIT_SHORT_PLACEHOLDER`](${{ github.event.pull_request.head.repo.html_url }}/commit/COMMIT_SHA_PLACEHOLDER)
-> **Generated at:** TIMESTAMP_PLACEHOLDER
+> **Analysis based on commit:** [\`${COMMIT_SHORT}\`](${{ github.event.pull_request.head.repo.html_url }}/commit/${COMMIT_SHA})
+> **Generated at:** ${TIMESTAMP}
 
 ### Summary
 
-STATUS_PLACEHOLDER
+${STATUS}
 
-SUMMARY_PLACEHOLDER
+${SUMMARY}
 
 ### Results
 
-- **Warnings:** WARNINGS_PLACEHOLDER
-- **Errors:** ERRORS_PLACEHOLDER
+- **Warnings:** ${WARNINGS}
+- **Errors:** ${ERRORS}
 
 EOFMARKER
 
-          # Replace placeholders
-          sed -i "s|COMMIT_SHORT_PLACEHOLDER|$COMMIT_SHORT|g" /tmp/sync-report.md
-          sed -i "s|COMMIT_SHA_PLACEHOLDER|$COMMIT_SHA|g" /tmp/sync-report.md
-          sed -i "s|TIMESTAMP_PLACEHOLDER|$TIMESTAMP|g" /tmp/sync-report.md
-          sed -i "s|STATUS_PLACEHOLDER|$STATUS|g" /tmp/sync-report.md
-          sed -i "s|SUMMARY_PLACEHOLDER|$SUMMARY|g" /tmp/sync-report.md
-          sed -i "s|WARNINGS_PLACEHOLDER|$WARNINGS|g" /tmp/sync-report.md
-          sed -i "s|ERRORS_PLACEHOLDER|$ERRORS|g" /tmp/sync-report.md
-
           # Add detailed findings if there are issues
           if [ "$ERRORS" -gt 0 ] || [ "$WARNINGS" -gt 0 ]; then
             cat >> /tmp/sync-report.md << 'EOF'