[obselate]

Summary

• Move all active SDK pins, benchmark provenance and SDK documentation to 0.5.26. Preserve the historical changelog entry for the earlier SDK upgrade.
• Regenerate the public API approval and refresh the plugin reference. Regenerated API pages have no content changes.
• Keep the existing G# workarounds. No Goo implementation source changes.

Compatibility notes

• Lavapipe profiler: one unreproduced failure, followed by 10/10 passes on each SDK. The final dual-driver matrix also passed.
• Generated record ToString changes to C# record formatting, for example Point { ... } instead of Point(x=..., y=...).
• Known G# SDK issues: GS0183 (gsharp#2489), compound if-let (gsharp#4961), and closure renumbering under hot reload. Structural edits can use Ctrl+R.

Checks

• Release core build with warnings as errors, CI-pinned strict G# lint, linter formatting, onboarding validation, VS Code syntax and Rider XML: passed.
• Release tests: CoreBehaviorTests 378/378, ApiContractTests 12/12, ImageLoadingTests 45/45, DevTools.Cli.Tests 23/23. CLI tests used isolated temporary/runtime discovery paths to exclude live desktop endpoints.
• NVIDIA and lavapipe: primitive, image, profiler, hide-resources and rounded-resize smokes all passed under isolated KWin with GOO_VK_DIAGNOSTICS=1.
• Vulkan ABI and damage-journal gates passed. Scene allocation gate remains 0 bytes.
• Linux NativeAOT image formats and audio dummy/unavailable-device smokes passed. Native compilation was single-threaded.
• Both checked-in backdrop shader artifacts matched fresh compilation. Goo dependency audit reported no vulnerable packages.
• Stock 0.5.26 hot reload dispatched both handler phases and passed the two-window Goo smoke with preserved state.
• Windows, macOS and Android device jobs were not run locally. Hosted CI is not claimed green.

Changelog: Build Goo with G# SDK 0.5.26 and refresh generated API metadata and SDK documentation.