fix: Update pipe path handling for cross-platform compatibility in ChildWorker and PipeName

ChildWorkerNode/child-worker.js

@@ -206,9 +206,12 @@ function sleep(ms, signal) {
 // Main
 // ─────────────────────────────────────────────────────────────────────────────
 
+// .NET uses different pipe paths per platform:
+// - Windows: \\.\pipe\{pipeName}
+// - Unix/macOS: /tmp/CoreFxPipe_{pipeName}
 const pipePath = process.platform === 'win32' 
     ? `\\\\.\\pipe\\${pipeName}` 
-    : `/tmp/${pipeName}`;
+    : `/tmp/CoreFxPipe_${pipeName}`;
 
 const socket = net.createConnection(pipePath, () => {
     // Connection established - send hello

CommIpc/PipeName.cs

@@ -1,4 +1,5 @@
 using System.Diagnostics;
+using System.Runtime.InteropServices;
 
 namespace CommIpc;
 
@@ -14,7 +15,10 @@ public static class PipeName
     }
 
     /// <summary>
-    /// Helpful for logs / debugging.
+    /// Returns the full pipe path for the current platform.
+    /// Windows: \\.\pipe\{pipeName}
+    /// Unix/macOS: /tmp/CoreFxPipe_{pipeName}
     /// </summary>
-    public static string Describe(string pipeName) => $"\\\\.\\pipe\\{pipeName}";
+    public static string Describe(string pipeName) =>
+        RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? $"\\\\.\\pipe\\{pipeName}" : $"/tmp/CoreFxPipe_{pipeName}";
 }