Skip macOS arm64 trimmed alias publish test

TESTING_GUIDE.md

@@ -44,6 +44,8 @@ The test project mirrors the production areas closely.
   is a coarse runaway guard for the real `InstallScriptTests.cs` C# extraction fixture. Its wall-clock budget is intentionally broader than a benchmark so slower or noisy CI hosts do not fail the suite for ordinary variance.
 - `IndexCommandRunnerTests.RunBackfillFold_PublishedTrimmedBinary_SerializesSuccessAndErrorJson`
   publishes a trimmed RID-specific CLI and runs whichever entry point the SDK emits (`cdidx.dll` through `dotnet` or the native `cdidx`/`cdidx.exe` apphost). It is reported as skipped on macOS arm64 while SDK/ILLink can crash before exercising `cdidx` (#2586). Do not assume every SDK/runtime pair writes a `cdidx.dll` into self-contained publish output.
+- `QueryCommandRunnerTests.RunPublishedTrimmedCli_SearchSupportsCSharpRazorAliases`
+  uses the same trimmed RID-specific publish path to verify C# Razor language aliases. It is also reported as skipped on macOS arm64 because the SDK/ILLink crash happens before the test reaches `cdidx`.
 - `McpServerTests.cs`
   MCP JSON-RPC behavior and tool outputs.
 - `HttpMcpTransportTests.cs`
@@ -227,6 +229,8 @@ dotnet test --filter "FullyQualifiedName~GitHelperTests"
   は実ファイル `InstallScriptTests.cs` を C# 抽出に通す coarse な runaway guard です。wall-clock の予算は benchmark より意図的に広く取り、遅い / 混雑した CI host で通常の揺れだけにより suite が失敗しないようにしています。
 - `IndexCommandRunnerTests.RunBackfillFold_PublishedTrimmedBinary_SerializesSuccessAndErrorJson`
   は trimmed な RID 固有 CLI を publish し、SDK が生成した entry point（`dotnet` 経由の `cdidx.dll`、または native の `cdidx`/`cdidx.exe` apphost）を実行します。self-contained publish output に常に `cdidx.dll` が出るとは仮定しないでください。
+- `QueryCommandRunnerTests.RunPublishedTrimmedCli_SearchSupportsCSharpRazorAliases`
+  は同じ trimmed RID 固有 publish 経路で C# Razor の言語 alias を検証します。このテストも macOS arm64 では、`cdidx` に到達する前に SDK/ILLink がクラッシュし得るため skipped として報告されます。
 - `McpServerTests.cs`
   MCP の JSON-RPC 挙動とツール出力のテスト。
 - `GitHelperTests.cs`

changelog.d/unreleased/2606.fixed.md

@@ -0,0 +1,17 @@
+---
+category: fixed
+issues:
+  - 2606
+affected:
+  - tests/CodeIndex.Tests/IndexCommandRunnerTests.cs
+  - tests/CodeIndex.Tests/QueryCommandRunnerTests.cs
+  - TESTING_GUIDE.md
+---
+
+## English
+
+- **macOS arm64 trimmed publish alias coverage is skipped while ILLink crashes (#2606)** — the C# Razor alias trimmed publish test now reports as skipped on macOS arm64 instead of failing before `cdidx` can run.
+
+## 日本語
+
+- **macOS arm64 の trimmed publish alias カバレッジを ILLink クラッシュ中は skip するようにしました (#2606)** — C# Razor alias の trimmed publish テストは、`cdidx` 実行前に失敗する代わりに macOS arm64 で skipped として報告されます。

tests/CodeIndex.Tests/IndexCommandRunnerTests.cs

@@ -18,6 +18,15 @@ public SkipOnMacOsArm64FactAttribute()
     }
 }
 
+public sealed class SkipOnMacOsArm64TheoryAttribute : TheoryAttribute
+{
+    public SkipOnMacOsArm64TheoryAttribute()
+    {
+        if (OperatingSystem.IsMacOS() && RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
+            Skip = "macOS arm64 SDK/ILLink currently crashes before this test can exercise cdidx (#2606).";
+    }
+}
+
 /// <summary>
 /// Tests for indexing command argument handling.
 /// インデックスコマンドの引数処理テスト。

tests/CodeIndex.Tests/QueryCommandRunnerTests.cs

@@ -1976,7 +1976,7 @@ public void RunPublishedTrimmedCli_SerializesQueryJsonAndErrorJson()
         }
     }
 
-    [Theory]
+    [SkipOnMacOsArm64Theory]
     [InlineData("cshtml")]
     [InlineData("razor")]
     public void RunPublishedTrimmedCli_SearchSupportsCSharpRazorAliases(string lang)