Removes validation that required non-empty item names, as parts
may legitimately have no label assigned.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Rename the core library project from SawCut to CutList.Core for consistent
branding across the solution. This includes:
- Rename project folder and .csproj file
- Update namespace from SawCut to CutList.Core
- Update all using statements and project references
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>