fix: correct portal build command in test-portal-builds.sh

- Fix portal build to use pnpm run build:portal instead of pnpm run build portal
- Portal builds now succeed across all environments
- Link check failures are separate issue (builds working properly)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: jonphipps

scripts/test-portal-builds.sh

@@ -66,7 +66,7 @@ for ENV_NAME in "${ENVIRONMENTS[@]}"; do
   echo "----------------------------------------------------"
 
   echo "Building portal (DOCS_ENV=$ENV_NAME)..."
-  (cd "$PROJECT_ROOT" && DOCS_ENV=$ENV_NAME pnpm run build portal)
+  (cd "$PROJECT_ROOT" && DOCS_ENV=$ENV_NAME pnpm run build:portal)
   if [ $? -ne 0 ]; then
     echo "❌ Build failed for DOCS_ENV=$ENV_NAME"
     OVERALL_SUCCESS=false