feat: RN TurboModule -- threading + Fabric integration, rebuilt (supersedes #46)

[DjDeveloperr]

Summary

Rebuilds the React Native TurboModule and Fabric integration around generic native-component contracts. The runtime now exposes one component definition API for native view creation, props, events, commands, layout, child mounting, controller containment, and teardown.

• installs the NativeScript interop bridge directly in the Worklets UI runtime
• keeps UIKit work on the main queue without synchronous cross-runtime calls
• scopes scheduled work to the component lifecycle so stale callbacks are discarded after invalidation
• registers generic Fabric component views and descriptors through the runtime gateway
• adds native controller-containment and descendant-query operations for atomic UIKit work
• configures Metro and the NativeScript plugin for production Bundle Mode with the required Worklets transforms

Architecture

defineNativeComponent owns the typed JavaScript contract. Fabric delegates native lifecycle hooks to the UI runtime, while the Objective-C++ layer handles mounting transactions, layout metrics, events, commands, controller ownership, and runtime invalidation. Component implementations remain outside the runtime package.

The old specialized UIKit host surface and its process-wide view swizzling are removed. This also removes the legacy registries, batch walkers, point-fix RPCs, frame-loop hook, and specialized controller/view APIs.

Verification

• config-plugin and CLI unit suites
• Release Bundle Mode M1 acceptance coverage for lifecycle hooks, main-queue execution, mounting transactions, layout decline, content-size propagation, commands, reentrancy, and invalidation
• generic iOS Simulator SDK builds
• repository CI

Known limitation

Completion blocks declared only by Objective-C protocols still require an explicit interop.Block signature until #71 lands. Class-declared completion parameters accept ordinary closures.

[coderabbitai]

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