Add extraction stall regression coverage

changelog.d/unreleased/2687.fixed.md

@@ -0,0 +1,19 @@
+---
+category: fixed
+issues:
+  - 2687
+  - 2689
+  - 2690
+  - 2693
+affected:
+  - src/CodeIndex/Cli/IndexCommandRunner.cs
+  - tests/CodeIndex.Tests/IndexCommandRunnerTests.cs
+---
+
+## English
+
+- **Indexing no longer stalls indefinitely on pathological symbol extraction (#2687, #2689, #2690, #2693)** - `cdidx index` now bounds symbol extraction progress and reports `E013_INDEX_EXTRACTION_STALLED` instead of hanging or misreporting the run as a user interrupt.
+
+## 日本語
+
+- **病的に遅いシンボル抽出で index が無期限に停止しないようになりました (#2687, #2689, #2690, #2693)** - `cdidx index` はシンボル抽出の進捗停止を制限し、ハングしたりユーザー割り込みとして誤報したりせず `E013_INDEX_EXTRACTION_STALLED` を報告します。

tests/CodeIndex.Tests/IndexCommandRunnerTests.cs

@@ -70,6 +70,39 @@ public void FormatIndexPhasePath_AppendsPhaseSuffixForJsonLiveness()
         Assert.Equal("src/App.cs (references)", message);
     }
 
+    [Fact]
+    public void Run_FilesMode_WhenSymbolExtractionStalls_ReportsStallInsteadOfInterrupt()
+    {
+        var priorTimeout = IndexCommandRunner.IndexExtractionStallTimeoutForTesting;
+        IndexCommandRunner.IndexExtractionStallTimeoutForTesting = () => TimeSpan.FromMilliseconds(1);
+        var projectRoot = CreateTempProject();
+        try
+        {
+            var source = Path.Combine(
+                GetRepositoryRoot(),
+                "src",
+                "CodeIndex",
+                "Indexer",
+                "Symbols",
+                "SymbolExtractor.JavaScriptTypeScriptSupport.cs");
+            File.Copy(source, Path.Combine(projectRoot, "slow.cs"));
+
+            var dbPath = Path.Combine(Path.GetTempPath(), $"cdidx_symbol_timeout_{Guid.NewGuid():N}.db");
+            var (exitCode, json, stderr) = RunAndCaptureJsonWithStderr([projectRoot, "--files", "slow.cs", "--db", dbPath, "--json", "--force"]);
+
+            Assert.Equal(CommandExitCodes.CancelledBySignal, exitCode);
+            Assert.Equal(CommandErrorCodes.IndexExtractionStalled, json.GetProperty("error_code").GetString());
+            Assert.Contains("Index extraction made no progress", json.GetProperty("message").GetString());
+            Assert.DoesNotContain(CommandErrorCodes.Interrupted, stderr);
+        }
+        finally
+        {
+            IndexCommandRunner.IndexExtractionStallTimeoutForTesting = priorTimeout;
+            SqliteConnection.ClearAllPools();
+            DeleteDirectory(projectRoot);
+        }
+    }
+
     [Fact]
     public void GetJsonIndexHeartbeatPath_UsesWorkerPhaseWhenMainThreadIsIdle()
     {