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Add feature description for widget/FRP bridge stream

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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FEATURE.md
··· 1 + # Feature: widget/FRP bridge 2 + 3 + Experimental work to enable reactive UI widgets (sliders, plots, mini-apps) 4 + driven by OCaml code running in the Web Worker. Backend-authoritative 5 + architecture: Worker owns state, view descriptions flow out via 6 + postMessage, user events flow back in. 7 + 8 + ## Scope 9 + 10 + - Evaluate Lwd vs Note as the reactivity library 11 + - Design a serializable view description format (no closures, no JS refs) 12 + - Implement experiments A–D (counter, richer widgets, TyXML integration) 13 + - Measure ergonomics, serialization format, latency, bundle size 14 + 15 + ## References 16 + 17 + - [Design](docs/plans/2026-02-20-ocaml-interactive-tutorials-design.md) — Section 5 18 + - [Plan](docs/plans/2026-02-20-ocaml-interactive-tutorials-plan.md) — Stream 4 (tasks 4.1–4.5)