feat: add broker streaming#873
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Replace the four positional generics on `MessageBus`, `Broker`, and
`InvokableNotRegisteredError` with a single `$ extends MessageBusContext`
bag. Adding a new feature now means adding a property to
`MessageBusContext` rather than threading a new positional generic
through every reference.
A `CreateMessageBusContext<Partial>` helper fills unspecified slots with
their defaults, so consumers only specify the slots they use. The
collection types (`Subscribers`, `Invokers`, `Streams`, …) and their
record interfaces now take `$` directly, which also threads the context
down into the stored `Broker<$>`.
BREAKING CHANGE: `MessageBus`, `Broker`, and `InvokableNotRegisteredError`
now take a single `MessageBusContext` type parameter instead of four
positional generics. Replace `MessageBus<Events, Gens, Invokables,
Streams>` with `MessageBus<CreateMessageBusContext<{ events: Events;
generators: Gens; invokables: Invokables; streams: Streams }>>`.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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