- **React introspection** - First-class React DevTools integration with new `react tree`, `react inspect <fiberId>`, `react renders start|stop`, and `react suspense` commands for full component-tree visibility, per-fiber props/hooks/state inspection, render profiling with mount/re-render counts and change details, and Suspense boundary classification with root-cause grouping and recommendations. React DevTools hook is vendored (MIT) and embedded in the binary with zero runtime dependencies (#1257)
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