docs: update CLAUDE.md to reference AwesomeAssertions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: HavenDV

CLAUDE.md

@@ -45,7 +45,7 @@ The SDK code is **entirely auto-generated** — do not manually edit files in `s
 - **Signing:** Strong-named assemblies via `src/key.snk`
 - **Versioning:** Semantic versioning from git tags (`v` prefix) via MinVer
 - **Analysis:** All .NET analyzers enabled, AOT/trimming compatibility enforced
-- **Testing:** MSTest + FluentAssertions
+- **Testing:** MSTest + AwesomeAssertions
 
 ### MEAI Integration