Document browser and worker ownership

Parent

Browser and worker integrations retain the factory contract while applications own clients, runtimes, caches, and disposal.

Execute representative generated RPC/HTTP operations through existing browser examples and ordinary factory tests.
Verify streams/metadata, cancellation, and resource cleanup through ordinary public-factory tests.
Retain browser-safe ESM packaging through native Vite+/tsdown validation and existing application builds.
Document host ownership and transport limits supported by current examples and upstream public APIs.
Provide a supplied worker-ready-client transport recipe where supported public APIs prove it; otherwise state the worker transport limitation and application-owned service requirements.