DispatcherHandle fluent chaining

## Describe the task

We often use and encourage the use of the dispatcher handle, in some cases we then want to dispatch multiple things. There might be an argument that those cases should be effects not dispatches, but if we allow the sequence of dispatches as a valid desired thing, the dispatcher handle should allow those to be fluent.

Start by locating DispatcherHandle and its existing dispatch methods, then read how callers currently issue multiple dispatches. Done means the dispatcher handle supports fluent chaining for a sequence of dispatches, with the expected behavior confirmed by the project's existing tests or usage patterns.

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