feat(S2-b): connect durable MQTT sync to capture workflow

tests/FieldLogger.Sync.Tests/FieldLogger.Sync.Tests.csproj

@@ -0,0 +1,35 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <!--
+    Headless tests for the cloud-sync core (S2-b/S2-c): durable-queue restart survival,
+    ack-release, exactly-once, backoff, broker-loss-safety, and LOG-7 no-silent-discard.
+    Plain net9.0 + xUnit so it runs in the QA gate (auto-discovered *.Tests.csproj) without
+    MAUI workloads or a live broker (uses a fake IMqttTransport).
+    Run: dotnet test tests/FieldLogger.Sync.Tests/FieldLogger.Sync.Tests.csproj
+  -->
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\FieldLogger.Sync\FieldLogger.Sync.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="..\..\..\meta\contracts\fixtures\app-log-*.json"
+          Link="ContractFixtures\%(Filename)%(Extension)"
+          CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+
+</Project>