Vanilla TS clients for the vesting product.

When you can't reach for a React hook (Node services, indexers, test suites, workers, server-side admin signing), these two main clients expose the same surface. Same public methods, same return shapes, same typed errors. The React hooks under @tokenops/sdk/fhe-vesting/react are thin wrappers over these. A third client, ConfidentialVestingFactoryAdvancedClient from @tokenops/sdk/fhe-vesting/advanced, extends the factory client with deterministic address prediction.