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Updates the reconciler to support React 19.2, including <Activity /> and useEffectEvent().

Because react-reconciler is published in lockstep with the React package, it is not seen as forwards compatible since React 19 and supports 19.2+.

We bundle react-reconciler for the moment since we are sure these features are forward compatible and do not present a breaking change. React packages inline the reconciler as well, but we have to ship both the development and production bundles.

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codesandbox-ci bot commented Nov 29, 2025

This pull request is automatically built and testable in CodeSandbox.

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