feat(releases): add SelfUpdater installer-asset matching

src/ClaudeDo.Releases/SelfUpdateResult.cs

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+namespace ClaudeDo.Releases;
+
+public sealed record InstallerAssetMatch(ReleaseAsset Asset, string Version);

src/ClaudeDo.Releases/SelfUpdater.cs

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+using System.Text.RegularExpressions;
+
+namespace ClaudeDo.Releases;
+
+public static partial class SelfUpdater
+{
+    [GeneratedRegex(@"^ClaudeDo\.Installer-(?<version>[\d\.]+)\.exe$", RegexOptions.IgnoreCase)]
+    private static partial Regex InstallerAssetRegex();
+
+    public static InstallerAssetMatch? FindInstallerAsset(IEnumerable<ReleaseAsset> assets)
+    {
+        foreach (var asset in assets)
+        {
+            var m = InstallerAssetRegex().Match(asset.Name);
+            if (m.Success)
+            {
+                return new InstallerAssetMatch(asset, m.Groups["version"].Value);
+            }
+        }
+        return null;
+    }
+}

tests/ClaudeDo.Releases.Tests/SelfUpdaterTests.cs

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+namespace ClaudeDo.Releases.Tests;
+
+public class SelfUpdaterAssetMatchingTests
+{
+    [Fact]
+    public void FindInstallerAsset_PicksInstallerExeByPattern()
+    {
+        var assets = new[]
+        {
+            new ReleaseAsset("ClaudeDo-0.3.0-win-x64.zip", "https://x/app.zip", 10),
+            new ReleaseAsset("ClaudeDo.Installer-0.3.0.exe", "https://x/inst.exe", 20),
+            new ReleaseAsset("checksums.txt", "https://x/checks", 1),
+        };
+
+        var result = SelfUpdater.FindInstallerAsset(assets);
+
+        Assert.NotNull(result);
+        Assert.Equal("ClaudeDo.Installer-0.3.0.exe", result!.Asset.Name);
+        Assert.Equal("0.3.0", result.Version);
+    }
+
+    [Fact]
+    public void FindInstallerAsset_ReturnsNullWhenAbsent()
+    {
+        var assets = new[]
+        {
+            new ReleaseAsset("ClaudeDo-0.3.0-win-x64.zip", "https://x/app.zip", 10),
+        };
+
+        Assert.Null(SelfUpdater.FindInstallerAsset(assets));
+    }
+
+    [Fact]
+    public void FindInstallerAsset_IgnoresAppZipThatContainsInstaller()
+    {
+        var assets = new[]
+        {
+            new ReleaseAsset("ClaudeDo.Installer.Portable-0.3.0.zip", "https://x/1", 1),
+            new ReleaseAsset("not-the-installer.exe", "https://x/2", 1),
+        };
+
+        Assert.Null(SelfUpdater.FindInstallerAsset(assets));
+    }
+}