chore: clean up whitespace and update gitignore

- Remove trailing whitespace in BIPUploadModule.bas
- Add missing newline at end of BomItem.cls
- Update .gitignore: rename Claude to AI Agent, add .sisyphus/

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

VBA/ClassModules/BomItem.cls

@@ -86,4 +86,4 @@ Public Function ToString() As String
                " | 类别:" & Me.category & _
                " | 代号:" & Me.code & _
                " | 名称:" & Me.Name
-End Function
+End Function