build: manage version via MinVer with AssemblyInformationalVersion

Uses MinVer to derive the version from git tags (prefix "v"), stored in
AssemblyInformationalVersion. Program.cs reads that attribute (stripping
the "+sha" build metadata) so the update-check compares against a clean
semver. CI overrides the tag via /p:MinVerVersionOverride=$VERSION.

.gitea/workflows/release.yml

@@ -53,7 +53,7 @@ jobs:
           cd "$WORK/src"
           dotnet publish src/ClaudeDo.App/ClaudeDo.App.csproj \
             -c Release -r win-x64 --self-contained true \
-            /p:Version=$VERSION -o out/app
+            /p:MinVerVersionOverride=$VERSION -o out/app
 
       - name: Publish ClaudeDo.Worker (win-x64, self-contained)
         env:
@@ -65,7 +65,7 @@ jobs:
           cd "$WORK/src"
           dotnet publish src/ClaudeDo.Worker/ClaudeDo.Worker.csproj \
             -c Release -r win-x64 --self-contained true \
-            /p:Version=$VERSION -o out/worker
+            /p:MinVerVersionOverride=$VERSION -o out/worker
 
       - name: Publish ClaudeDo.Installer (win-x64, single-file, framework-dependent)
         env:
@@ -80,7 +80,7 @@ jobs:
           # Target machines need .NET 8 Desktop Runtime (x64).
           dotnet publish src/ClaudeDo.Installer/ClaudeDo.Installer.csproj \
             -c Release -r win-x64 --self-contained false \
-            /p:Version=$VERSION /p:PublishSingleFile=true \
+            /p:MinVerVersionOverride=$VERSION /p:PublishSingleFile=true \
             -o out/installer
 
       - name: Package assets

Directory.Build.props

@@ -0,0 +1,8 @@
+<Project>
+  <PropertyGroup>
+    <MinVerTagPrefix>v</MinVerTagPrefix>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="MinVer" Version="5.0.0" PrivateAssets="all" />
+  </ItemGroup>
+</Project>

src/ClaudeDo.App/Program.cs

@@ -85,7 +85,10 @@ sealed class Program
         sc.AddSingleton(sp =>
         {
             var releases = sp.GetRequiredService<IReleaseClient>();
-            var version = Assembly.GetEntryAssembly()?.GetName().Version?.ToString() ?? "0.0.0.0";
+            var informational = Assembly.GetEntryAssembly()?
+                .GetCustomAttribute<AssemblyInformationalVersionAttribute>()?.InformationalVersion;
+            // Strip MinVer build metadata ("+sha") and any prerelease suffix for the update-compare.
+            var version = (informational ?? "0.0.0").Split('+')[0];
             return new UpdateCheckService(releases, version);
         });