Update changelog for color pipeline and picker

CHANGELOG.md

@@ -20,6 +20,10 @@
 - New CLI commands: `open-pencil convert` for document conversion, `open-pencil formats` to inspect readable/writable/exportable formats, and `open-pencil lint` for design consistency, structure, and accessibility checks
 - CLI export now supports `.fig` output and routes PNG/JPG/WEBP/SVG/JSX/`.fig` through the shared IO layer
 - `Open…` now supports `.pen` Pencil documents through the shared document reader pipeline while keeping `.fig` as the native save format
+- Display‑P3 document color space pipeline — documents now default to Display‑P3, `.fig` import/export preserves document color profiles, the live canvas requests P3 surfaces with sRGB fallback, and raster/SVG export paths accept explicit color-space targets
+- Color picker overhaul — unified `RGB` / `HSL` / `HSB` / `OkHCL` field formats, slider-space-aware track/thumb previews, and better neutral-color editing behavior for fills, strokes, gradient stops, and component fills
+- OkHCL metadata now round-trips through `.fig` plugin data and integrates directly into the main fill/stroke color workflow with preview gamut diagnostics
+- Vue SDK now exposes reusable color-picker model helpers and solid fill/stroke commit helpers for custom editor shells
 - Update built-in Z.ai and MiniMax model lists — Z.ai now uses the Anthropic-compatible endpoint for GLM coding models, adds GLM-5.1, and MiniMax adds M2.7 / M2.7-highspeed
 
 ### Fixes