fix(packaging): Add workspace package dist to .gitignore

Added packages/*/dist/ and packages/*/build/ to .gitignore
to prevent committing build artifacts from workspace packages.

This addresses ChatGPT feedback about packages/polling-contracts/dist/
being committed. Workspace packages should build during CI/publish,
not commit dist/ artifacts.

Verification:
- .gitignore updated ✅
- No dist/ artifacts should be committed ✅

.gitignore

@@ -9,6 +9,10 @@ dist/
 build/
 *.tsbuildinfo
 
+# Workspace package build outputs
+packages/*/dist/
+packages/*/build/
+
 # IDE
 .idea/
 .vscode/