Update changelog for latest work (#2868)

Author: jstone-lucasfilm

CHANGELOG.md

@@ -28,17 +28,17 @@
 
 ### Changed
 - Improved specifications for the [Standard Nodes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2520), [PBR Nodes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2732), and [NPR Nodes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2767), converting prose descriptions to structured tables.
-- Consolidated hardware shader generation in a new [MaterialXGenHw module](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2565), [unifying node implementations](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2555) across GLSL and MSL, adopting [syntax-portable type names](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2625) for native Metal support, and [streamlining](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2652) the ShaderGenerator API across hardware shading language generators.
+- Updated the OpenPBR Surface definition to [v1.1.1](https://github.com/AcademySoftwareFoundation/OpenPBR/releases/tag/v1.1.1), [omitting specular_weight](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2863) from the computation of metal edge tint and [connecting geometry_thin_walled](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2759) to the surface node.
+- Updated the UsdPreviewSurface definition to the latest [Pixar specification](https://openusd.org/release/spec_usdpreviewsurface.html), [revising the interpretation](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2796) of `opacity`, `opacityMode`, and `opacityThreshold`.
 - Consolidated shading graphs for [OpenPBR Surface, Standard Surface](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2832), and [glTF PBR](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2850), replacing hardcoded graph overrides with composable graph refactoring.
+- Consolidated hardware shader generation in a new [MaterialXGenHw module](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2565), [unifying node implementations](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2555) across GLSL and MSL, adopting [syntax-portable type names](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2625) for native Metal support, and [streamlining](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2652) the ShaderGenerator API across hardware shading language generators.
 - Refactored the [layout engine](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2775) in the MaterialX Graph Editor, organizing its logic into a new Layout class aligned with the Sugiyama layered graph drawing algorithm.
-- Aligned [UsdPreviewSurface opacity](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2796) with the upcoming Pixar specification, updating the handling of `opacity`, `opacityMode`, and `opacityThreshold` inputs.
 - Improved the [Metal syntax](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2622) in generated MSL shaders, replacing preprocessor workarounds with native Metal code.
 - Improved the [MDL generator](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2684) with support for backsurface shaders and [volume IOR](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2747) preservation.
 - Improved [material name handling](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2804) in shader generation, converting names to identifiers early for cleaner output naming.
 - Improved [thread safety](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2736) in the Document cache, adopting `std::shared_mutex` for reader and writer guarantees.
 - Improved [hextiling implementations](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2615) in GLSL and MDL, using array-based data structures for better maintainability.
 - Improved the translation graph from Standard Surface to glTF PBR, adding support for [specular and specular color](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2623), [IOR](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2589), [emissive strength](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2593), [dispersion](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2636), [normal and tangent](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2587), and [alpha](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2591).
-- Updated the [OpenPBR Surface definition](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2759) to connect `geometry_thin_walled` to the surface node.
 - Improved the [MaterialX Web Viewer](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2798) with an FPS timer, consistent styling, improved menu labels, and responsive layout for mobile.
 - Modernized [JavaScript build and test infrastructure](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2854) in the MaterialX Web Viewer, migrating to ES modules, adopting Playwright for browser testing, and leveraging npm workspaces.
 - Upgraded the default [three.js version](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2858) to r183 in the MaterialX Web Viewer.