Change the protected row number range from 7000-7999 to 2000-7999 to prevent deletion of materials in this broader range.
- Updated isMaterialDeletable() method logic
- Updated getSkipReason() error messages
- Updated test cases to reflect new range boundaries
- Updated documentation templates and error collection guide
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>