AdaptiveCards search/execute improvements

[tracyboehrer]

Fixes #307

[Copilot]

Pull Request Overview

This pull request improves the AdaptiveCards search and execute functionality by enhancing error handling, refactoring validation logic, and expanding test coverage.

• Refactored validation logic into reusable methods (TryValidateSearchInvokeValue and TryValidateActionInvokeValue)
• Improved error handling for malformed or incomplete invoke actions and search requests
• Added comprehensive test coverage for error scenarios including null actions, unexpected action types, missing search fields

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
AdaptiveCardsTests.cs	Renamed tests for clarity, added new test cases for error scenarios (null actions, unexpected action types, missing search value/kind/queryText)
AdaptiveCardSearchInvokeValue.cs	New file extracting the inner class to a top-level class for better organization
AdaptiveCardInvokeResponseFactory.cs	Added SearchResponse factory method and two validation methods for search and action invoke values with proper error handling
AdaptiveCard.cs	Refactored route handlers to use new validation methods, improved error response handling, simplified null checks
CopilotStudioAgentConnector.zip	Binary file update (sample connector)

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 5 changed files in this pull request and generated 8 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.