Add .pnpm-store to .gitignore

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: statico

.gitignore

@@ -39,6 +39,7 @@ build/Release
 
 # Dependency directories
 node_modules/
+.pnpm-store/
 jspm_packages/
 
 # TypeScript v1 declaration files