* Initial plan * Add Claude Skills sample and integration tests for Anthropic - Add Agent_Anthropic_Step04_UsingSkills sample demonstrating pptx skill usage - Add integration tests for skills functionality - Update README.md with new sample reference - Update solution file to include new sample project Co-authored-by: rogerbarreto <19890735+rogerbarreto@users.noreply.github.com> * Simplify Anthropic Skills sample with AsAITool and add file download * Remove excessive comments from integration tests * Update README with correct model name and syntax * Fix Anthropic SDK 12.3.0 API changes: APIKey->ApiKey, SkillListPageResponse->SkillListPage, Data->Items --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: rogerbarreto <19890735+rogerbarreto@users.noreply.github.com>