feat(core): async auto tracking and async computed #8796
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useComputed$ accepts async functions and auto-tracks reads (including after await). The async engine (jobs, pending, error, polling) moves into ComputedSignalImpl, and AsyncSignalImpl becomes a thin subclass. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Mark useAsync$, createAsync$, AsyncSignal and related types deprecated in favor of useComputed$, and migrate all docs and examples to useComputed$ and `.pending`. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Converts async functions into generator functions and adds a harness so that reactive tracking can happen across await.
This also means that there is no more reason for AsyncSignal, so the async machinery moves to ComputedSignal, we will drop Asyncsignal before V2.0