fix: make CliCommandTests configuration-aware for CI builds

The tests were hard-coded to look for the CLI DLL in bin/Debug/, but CI
builds in Release mode. This caused all CLI command tests to fail in CI
with "Could not execute because the specified command or file was not found."

Now uses preprocessor directives to detect the build configuration and
look in the correct bin directory.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: sakrut

AiCodeGraph.Tests/CliCommandTests.cs

@@ -6,8 +6,14 @@ namespace AiCodeGraph.Tests;
 
 public class CliCommandTests : TempDirectoryFixture
 {
+#if DEBUG
+    private const string BuildConfiguration = "Debug";
+#else
+    private const string BuildConfiguration = "Release";
+#endif
+
     private static readonly string CliDll = Path.GetFullPath(
-        Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", "AiCodeGraph.Cli", "bin", "Debug", "net8.0", "AiCodeGraph.Cli.dll"));
+        Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", "AiCodeGraph.Cli", "bin", BuildConfiguration, "net8.0", "AiCodeGraph.Cli.dll"));
 
     public CliCommandTests() : base("cli-test") { }