Release v4.9.0

Added

• Typed binding contracts for data context, query result, component output and literal sources, with resolver diagnostics for cycles, missing components and type mismatches. (part of #69)
• React component output scope for element-to-element bindings, including lifecycle cleanup for cleared selections. (part of #69)
• Package design-time metadata and optional React design-time bundles for previews, designers, property editors, display renderers and canonical edit actions. (part of #70)
• Command form descriptors for auto/manual mode, responsive columns, field widths and deterministic field generation through the native Arc form runtime. (part of #71)
• Stable destination, outlet and navigation metadata for hierarchical screens, dialogs, authored routes and toolbar/navigation chrome. (part of #74)
• Frontend package host configuration for approved bundles, profile resolution, assets, design-time loading policy and duplicate runtime singleton diagnostics. (part of #75)
• Business blueprint pattern and package-hosting documentation for embedded and standalone rendering hosts. (part of #73)