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/Tickets/ListConfigTicketProjectTests.cs

@@ -9,10 +9,9 @@ using Xunit;
 
 namespace ClaudeDo.Worker.Tests.Tickets;
 
-/// TicketProjectId shares the exact SetConfigAsync-copies-verbatim trap that SerializeOnFileOverlap
-/// already hit once: any writer that doesn't carry the field forward silently clears the
-/// list<->ticket-project link. UpdateListConfigDto's TicketProjectId is tri-state for the same
-/// reason SerializeOnFileOverlap is: null = keep stored, <=0 = clear, >0 = set. The MCP
+/// TicketProjectId sits in the SetConfigAsync-copies-verbatim trap: any writer that doesn't carry
+/// the field forward silently clears the list&lt;-&gt;ticket-project link. UpdateListConfigDto's
+/// TicketProjectId is therefore tri-state: null = keep stored, &lt;=0 = clear, &gt;0 = set. The MCP
 /// set_list_config tool doesn't expose the field at all (UI-only), so it must preserve whatever is
 /// already stored.
 public sealed class ListConfigTicketProjectTests : IDisposable