feat(states): add readState result-builder reader with tests#27
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Changes:
readState(_:)toStateUpdatable, letting callers read several@MainActorvalues in a single hop and get back a single value or a tuple. Backed by a newStateValueBuilderresult builder using parameter packs for arbitrary arity. Tightens concurrency by making the protocolSendableand its update/read blocks@Sendable.