fix: remove orphaned JSON fragment from cve-fixer FIELD_REFERENCE.md

Address CodeRabbit review feedback: leftover JSON lines from a removed
"environment configuration" example were dangling after the artifact
path customization instructions.

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

Author: jwm4

workflows/cve-fixer/FIELD_REFERENCE.md

@@ -64,11 +64,6 @@ To use a different base directory, update:
 
 1. `systemPrompt` OUTPUT LOCATIONS section
 2. All command files in `.claude/commands/` to reference new paths in their ## Output sections
-  "ARTIFACTS_DIR": "artifacts/cve-fixer",
-  "SCAN_TOOLS": "snyk,npm-audit,trivy",
-  "LOG_LEVEL": "info"
-}
-```
 
 ### Customizing for specific compliance frameworks