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docs(charts): mark ChartsV2 ARCHITECTURE as proposed/not-yet-implemented (#556) #718

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docs(charts): mark ChartsV2 ARCHITECTURE as proposed/not-yet-implemented (#556) #718

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18 changes: 14 additions & 4 deletions packages/react-ui/src/components/ChartsV2/ARCHITECTURE.md
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# ChartsV2 Architecture

> Auto-maintained by architect agent. Last updated: 2026-03-18 (rev 4)
# ChartsV2 Architecture (Proposed — Not Yet Implemented)

> **Status: PROPOSED / PLANNED.** This document is a forward-looking design
> proposal for a D3-based charting system. **None of the modules, hooks,
> components, files, or tests described below exist yet.** This directory
> (`ChartsV2/`) currently contains only this document.
>
> The chart implementation that ships today lives in
> [`../Charts/`](../Charts) (the existing Recharts-based system). Until the work
> described here lands, treat every "is", "provides", "uses", and "renders"
> statement in this document as **intended/target behavior**, not current code.
>
> Auto-maintained by architect agent. Last design revision: 2026-03-18 (rev 4).

## Overview

ChartsV2 is a D3-based charting system within OpenUI's React component library. It provides 7 chart types across 3 topologies (cartesian-scrollable, cartesian-condensed, and polar). D3 is used strictly for math (scales, path generation, stacking); React owns the DOM via JSX. The system replaces the original Recharts-based `Charts/` package.
ChartsV2 is the **proposed** D3-based charting system for OpenUI's React component library. The design targets 7 chart types across 3 topologies (cartesian-scrollable, cartesian-condensed, and polar). D3 would be used strictly for math (scales, path generation, stacking); React would own the DOM via JSX. Once implemented, the system is intended to replace the existing Recharts-based `Charts/` package.

The design follows a **hook-orchestrated architecture**: each chart delegates all shared state management (data, dimensions, hover, scroll, legend, tooltip) to a single "orchestrator" hook, then supplies only chart-specific rendering (series geometry, crosshairs, axis variant).

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