refactor: Datei-Scope-Serialisierung entfernen

ScopeGlobs auf Tasks und SerializeOnFileOverlap auf der Listen-Config waren
ungenutzt: der Scope wurde nie befuellt, also hat der Queue-Picker nie
serialisiert. ScopeOverlap, das Picker-Gate, die DTO-Felder, die UI-Option und
die Spalten fallen weg (Migration DropFileScopeSerialization).

tests/ClaudeDo.Worker.Tests/External/ConfigMcpToolsTests.cs

@@ -312,7 +312,7 @@ public sealed class ConfigMcpToolsTests : IDisposable
             Model = "sonnet",
             SessionSkills = "[\"superpowers\"]",
             VerifyCommand = "dotnet build",
-            SerializeOnFileOverlap = true,
+            PermissionMode = "acceptEdits",
         });
 
         await _sut.SetListConfig(listId, model: "opus", cancellationToken: CancellationToken.None);
@@ -324,7 +324,7 @@ public sealed class ConfigMcpToolsTests : IDisposable
         Assert.Equal("dotnet build", cfg.VerifyCommand);
         // SetConfigAsync copies the entity verbatim, so a field this tool doesn't expose would
         // reset to its default unless it is carried over explicitly.
-        Assert.True(cfg.SerializeOnFileOverlap);
+        Assert.Equal("acceptEdits", cfg.PermissionMode);
     }
 
     [Fact]
@@ -335,7 +335,7 @@ public sealed class ConfigMcpToolsTests : IDisposable
         {
             ListId = listId,
             Model = "sonnet",
-            SerializeOnFileOverlap = true,
+            PermissionMode = "acceptEdits",
         });
 
         var result = await _sut.SetListConfig(
@@ -349,7 +349,7 @@ public sealed class ConfigMcpToolsTests : IDisposable
         var cfg = await _lists.GetConfigAsync(listId);
         Assert.NotNull(cfg);
         Assert.Null(cfg!.Model);
-        Assert.True(cfg.SerializeOnFileOverlap);
+        Assert.Equal("acceptEdits", cfg.PermissionMode);
     }
 
     [Fact]