fix: remove --format flag from panic-attack command

panic-attack writes JSON automatically when --output is specified.
The --format flag doesn't exist in the CLI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Jonathan D.A. Jewell

.github/workflows/scan-and-report.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Run scan
         id: scan
         run: |
-          panic-attack assail ${{ inputs.repo_path }} --format json --output scan-result.json
+          panic-attack assail ${{ inputs.repo_path }} --output scan-result.json
           echo "scan_complete=true" >> $GITHUB_OUTPUT
 
       - name: Send to verisimdb-data