Description

All 15 tests in CopilotChatClientTests fail with the same root cause:

System.NotSupportedException: CopilotChatClient requires async disposal. Use 'await using' or call DisposeAsync() directly.

The error is thrown from CopilotChatClient.Dispose() (line 245 of Agents/Infrastructure/CopilotChatClient.cs). The synchronous Dispose() method throws NotSupportedException, causing every test that constructs a CopilotChatClient and disposes it synchronously to fail.

Failing Tests

All in CobolToQuarkusMigration.Tests/Agents/Infrastructure/CopilotChatClientTests.cs:

• Constructor tests
• Metadata tests
• Service resolution tests
• Disposal tests

Suggested Fix

Update the test fixtures to use await using or call DisposeAsync() instead of relying on synchronous Dispose(). Alternatively, implement a non-throwing synchronous Dispose() that delegates to DisposeAsync() if the tests need to support both patterns.

Context

Discovered during review of PR #67. These failures are pre-existing and unrelated to that PR's changes.