Align v20 npm metadata with CI

[andrefarzat]

Summary

• align packageManager with npm 11.12.1 used by CI
• retain Jasmine 5 because v20 remains on Zone.js 0.15

Validation

• clean npm ci with Node 24.15.0 and npm 11.12.1
• npm run lint
• npm test
• npm run build:demo
• npm audit --omit=dev --audit-level=high
• npm run verify:package
• npm run verify:consumer