feat(kms): Implement file-backed key management commands and handlers

- Added `kms export` and `kms import` commands to manage file-backed signing keys.
- Implemented `HandleKmsExportAsync` and `HandleKmsImportAsync` methods in CommandHandlers for exporting and importing key material.
- Introduced KmsPassphrasePrompt for secure passphrase input.
- Updated CLI architecture documentation to include new KMS commands.
- Enhanced unit tests for KMS export and import functionalities.
- Updated project references to include StellaOps.Cryptography.Kms library.
- Marked KMS interface implementation and CLI support tasks as DONE in the task board.

src/Cli/__Tests/StellaOps.Cli.Tests/Plugins/CliCommandModuleLoaderTests.cs

@@ -1,32 +1,59 @@
 using System;
 using System.CommandLine;
 using System.IO;
-using System.Threading;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Logging;
-using Microsoft.Extensions.Logging.Abstractions;
-using StellaOps.Cli.Configuration;
-using StellaOps.Cli.Plugins;
-using Xunit;
+using System.Text.Json;
+using System.Threading;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging.Abstractions;
+using StellaOps.Cli.Configuration;
+using StellaOps.Cli.Plugins;
+using StellaOps.Cli.Plugins.NonCore;
+using StellaOps.Cli.Tests.Testing;
+using Xunit;
 
 namespace StellaOps.Cli.Tests.Plugins;
 
 public sealed class CliCommandModuleLoaderTests
 {
-    [Fact]
-    public void RegisterModules_LoadsNonCoreCommandsFromPlugin()
-    {
-        var options = new StellaOpsCliOptions();
-        var repoRoot = Path.GetFullPath(
-            Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", ".."));
-
-        options.Plugins.BaseDirectory = repoRoot;
-        options.Plugins.Directory = "plugins/cli";
-        options.Plugins.ManifestSearchPattern = "manifest.json";
-
-        var services = new ServiceCollection()
-            .AddSingleton(options)
-            .BuildServiceProvider();
+    [Fact]
+    public void RegisterModules_LoadsNonCoreCommandsFromPlugin()
+    {
+        using var temp = new TempDirectory();
+        var manifestDirectory = Path.Combine(temp.Path, "plugins", "cli");
+        Directory.CreateDirectory(manifestDirectory);
+
+        var assemblyPath = typeof(NonCoreCliCommandModule).Assembly.Location;
+        var manifestPath = Path.Combine(manifestDirectory, "noncore.manifest.json");
+        var manifestBody = new
+        {
+            schemaVersion = CliPluginManifest.CurrentSchemaVersion,
+            id = "stellaops.cli.plugins.noncore",
+            displayName = "NonCore CLI Commands",
+            version = "1.0.0",
+            requiresRestart = true,
+            entryPoint = new
+            {
+                type = "dotnet",
+                assembly = assemblyPath,
+                typeName = typeof(NonCoreCliCommandModule).FullName
+            }
+        };
+
+        File.WriteAllText(
+            manifestPath,
+            JsonSerializer.Serialize(manifestBody, new JsonSerializerOptions(JsonSerializerDefaults.Web) { WriteIndented = true }));
+
+        var options = new StellaOpsCliOptions();
+        options.Plugins.BaseDirectory = temp.Path;
+        options.Plugins.Directory = "plugins/cli";
+        options.Plugins.ManifestSearchPattern = "*.manifest.json";
+        options.Plugins.SearchPatterns.Clear();
+        options.Plugins.SearchPatterns.Add(Path.GetFileName(assemblyPath));
+
+        var services = new ServiceCollection()
+            .AddSingleton(options)
+            .BuildServiceProvider();
 
         var logger = NullLoggerFactory.Instance.CreateLogger<CliCommandModuleLoader>();
         var loader = new CliCommandModuleLoader(services, options, logger);