Stufe 4c (#764): Bezeichner auf Englisch - Typen, Methoden, Felder, Parameter, Locals, Testnamen

Mit Roslyn umbenannt (Verweise folgen, Zeichenketten bleiben unberuehrt).
Nicht umbenannt, weil gespeichert oder ueber die API gebunden (Stufe 4e):
Properties, Record-Parameter, Enum-Member sowie die Parameter der
Endpunkt-Handler (Routen-/Query-Bindung ueber den Namen). Die JSON-Felder
anonymer Objekte bleiben ausdruecklich benannt (JsonFilter: pfad).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ClawdDotNet.Desktop/HeadlessRun.cs

@@ -111,35 +111,35 @@ internal static class HeadlessRun
     /// the orderly shutdown is still running — and exactly then the write buffer
     /// of the log is flushed. An end without these lines is the state from #529.</para>
     /// </summary>
-    private static async Task WaitForShutdownAsync(ILogger logger, InstanceControl steuerung)
+    private static async Task WaitForShutdownAsync(ILogger logger, InstanceControl control)
     {
-        var schluss = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
+        var conclusion = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
 
-        void Beenden(string grund)
+        void Shutdown(string reason)
         {
-            if (schluss.TrySetResult())
-                logger.LogInformation("Beendigung angefordert ({Grund}).", grund);
+            if (conclusion.TrySetResult())
+                logger.LogInformation("Beendigung angefordert ({Grund}).", reason);
         }
 
         // The instance manager, via the socket. The usual way, as soon as it exists:
         // it asks instead of shooting - an instance process holds an open database
         // and running agents, and both want to be brought to an end.
-        steuerung.ShutdownRequested += () => Beenden("Instanzmanager");
+        control.ShutdownRequested += () => Shutdown("Instanzmanager");
 
         using var sigterm = PosixSignalRegistration.Create(PosixSignal.SIGTERM, context =>
         {
             context.Cancel = true;
-            Beenden("SIGTERM");
+            Shutdown("SIGTERM");
         });
 
         using var sigint = PosixSignalRegistration.Create(PosixSignal.SIGINT, context =>
         {
             context.Cancel = true;
-            Beenden("SIGINT");
+            Shutdown("SIGINT");
         });
 
-        AppDomain.CurrentDomain.ProcessExit += (_, _) => Beenden("ProcessExit");
+        AppDomain.CurrentDomain.ProcessExit += (_, _) => Shutdown("ProcessExit");
 
-        await schluss.Task;
+        await conclusion.Task;
     }
 }