chore: standardize .gitignore across repos

Author: CalvinAllen

.gitignore

@@ -183,6 +183,9 @@ orleans.codegen.cs
 # RIA/Silverlight projects
 Generated_Code/
 
+# SDK-style project generated files
+Generated/
+
 # Backup & report files from converting an old project file
 # to a newer Visual Studio version. Backup files are not needed,
 # because we have git ;-)
@@ -279,3 +282,7 @@ $RECYCLE.BIN/
 
 # Windows shortcuts
 *.lnk
+
+# Claude Code local settings
+CLAUDE.local.md
+.claude/