A tiny Fiber renderer
summary
Claim: the Fiber reconciler makes custom renderers practical — a full hostConfig of ~21 methods plus the reconciler factory is enough to get a renderer running. Implementation uses react-fiber-reconciler, implements createContainer and updateContainer, implements scheduling hooks (requestAnimationFrame / requestIdleCallback semantics) and basic host methods, and wires up DevTools. Built a react Hardware renderer that blinks an LED; it actually works. Host specifics and prepareUpdate diffs decide success.
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