refactor(react): promote future API to default entry point

[tonyfromundefined]

Summary

• Move src/future/ contents to src/ root, making the Future API the default @stackflow/react entry point
• Delete src/stable/ directory entirely (removes useActions, useStepActions, stable stackflow)
• Remove ./stable and ./future subpath exports from package.json
• Update all downstream packages: @stackflow/react/future → @stackflow/react, useActions → useFlow, ActivityComponentType → ActivityComponentTypeByParams for params inference

Test plan

• yarn build passes
• yarn typecheck passes
• yarn test passes (167 tests)

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Latest commit: 2a6f7e3

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• @stackflow/demo

@stackflow/compat-await-push

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commit: ab6f59e

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
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