v9.4.2

• Publish the playground package with customizable document languages, panels, template metadata, and cancellable asynchronous renderers (#788, #789).
• Add FlameTrailLayer with the TripsLayer API, rising 3D flames, drifting embers, and animation while the playhead stays still on WebGL2 and WebGPU (#765).
• Fit the full flame footprint and embers to WebGPU terrain when using the upstream deck.gl TerrainExtension port (#773; visgl/deck.gl#10751). With the published SDK, WebGPU paths use supplied XYZ elevations; WebGL2 supports GPU height-map fitting.
• Add the FlameTrailLayer terrain example with two continuous flames and Length, Width, and Color controls (#769).
• React Fiber remains excluded pending its initial npm setup; its source and examples remain available.
• Improve TreeLayer orientation and geometry reuse; add Seasonal Farm and GlobalGridLayer examples (#743, #749, #752).
• Expand the website gallery and playground with schema validation, managed data sources, host-owned SQL, camera controls, and editing tools.
• Align loaders.gl dependencies on 4.5.1 and Apache Arrow on 17; fix layer rendering and resource cleanup.
• See What's New and the Upgrade Guide for details.