feat: complete live and async form validation

[vannt-dev]

Summary

• make isValid reflect current synchronous validity in React, Vue, and Angular
• add validateAsync and await async-capable validation once during submit
• report pending Promise-like validators, including ZoneAwarePromise
• let controlled form errors drive renderer errors across adapters and nested groups
• add regression coverage and UI-kit recipes for Ant Design, Vuetify, and Angular Material

Verification

• npm run build
• npm test (511 tests)
• npm run test:scripts (38 tests)
• npm run lint
• npm run typecheck --workspaces --if-present
• npm run format-check
• npm run lint:cross-framework
• npm run lint:renderer-parity
• npm run verify-framework-deps