fix: persist p-rec-update package load diagnostics

tests/Launcher.Next.Tests/Launcher.Next.Tests.csproj

@@ -10,6 +10,7 @@
     <ProjectReference Include="..\..\Launcher.Next.Application\Launcher.Next.Application.csproj" />
     <ProjectReference Include="..\..\Launcher.Next.Infrastructure\Launcher.Next.Infrastructure.csproj" />
     <ProjectReference Include="..\..\Launcher.Next.Autodesk\Launcher.Next.Autodesk.csproj" />
+    <ProjectReference Include="..\..\Launcher.Next.App\Launcher.Next.App.csproj" />
   </ItemGroup>
   <ItemGroup><None Update="fixtures\p-rec-annot-pilot.manifest.json" CopyToOutputDirectory="PreserveNewest" /></ItemGroup>
 </Project>

tests/Launcher.Next.Tests/LocalParityEvidenceTests.cs

@@ -0,0 +1,39 @@
+using System.Text.Json;
+using Launcher.Next.App;
+using Xunit;
+
+namespace Launcher.Next.Tests;
+
+public sealed class LocalParityEvidenceTests
+{
+    [Fact]
+    public async Task EvidenceWriter_AtomicallyPublishesValidatedSchema()
+    {
+        var root = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N"));
+        try
+        {
+            Directory.CreateDirectory(root);
+            var path = await LocalParityLaunchService.WriteEvidenceAsync(root, new { schemaVersion = 4, state = "PACKAGE_LOAD_VERIFIED" }, CancellationToken.None);
+            Assert.True(File.Exists(path));
+            using var document = JsonDocument.Parse(await File.ReadAllTextAsync(path));
+            Assert.Equal(4, document.RootElement.GetProperty("schemaVersion").GetInt32());
+            Assert.False(File.Exists(path + ".tmp"));
+        }
+        finally { if (Directory.Exists(root)) Directory.Delete(root, recursive: true); }
+    }
+
+    [Fact]
+    public async Task EvidenceWriter_ReplacesStaleTemporaryArtifact()
+    {
+        var root = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N"));
+        try
+        {
+            Directory.CreateDirectory(root);
+            await File.WriteAllTextAsync(Path.Combine(root, "controlled-local-parity-launch.json.tmp"), "stale");
+            var path = await LocalParityLaunchService.WriteEvidenceAsync(root, new { schemaVersion = 4, terminalResult = "PACKAGE_LOAD_VERIFIED" }, CancellationToken.None);
+            Assert.Contains("PACKAGE_LOAD_VERIFIED", await File.ReadAllTextAsync(path));
+            Assert.False(File.Exists(path + ".tmp"));
+        }
+        finally { if (Directory.Exists(root)) Directory.Delete(root, recursive: true); }
+    }
+}