feat: Parent-Child TaskFlow — Delegated durch sichtbare Child-Tasks ersetzt

- Delegated State aus Board, Entities, DTOs, Frontend-Spalten und Tests entfernt
- Parent-Tasks bleiben InProgress waehrend delegierter Agentenarbeit
- Child-Tasks laufen sichtbar mit normalen States und parentTaskId
- Doku: README, Phase 3, Changelog, Controller-Kommentare angepasst
- openclaw-task-board-flow.md als Referenzdoku hinzugefuegt
- 73/73 Backend-Tests gruen, Frontend-Build gruen

backend/Data/Entities.cs

@@ -18,7 +18,6 @@ public enum TaskState
 {
     Backlog,
     InProgress,
-    Delegated,
     Blocked,
     Done,
     Review
@@ -30,7 +29,6 @@ public static class TaskStateHelper
     {
         [TaskState.Backlog] = "Backlog",
         [TaskState.InProgress] = "In progress",
-        [TaskState.Delegated] = "Delegated",
         [TaskState.Blocked] = "Blocked",
         [TaskState.Done] = "Done",
         [TaskState.Review] = "Review"
@@ -40,7 +38,6 @@ public static class TaskStateHelper
     {
         ["Backlog"] = TaskState.Backlog,
         ["In progress"] = TaskState.InProgress,
-        ["Delegated"] = TaskState.Delegated,
         ["Blocked"] = TaskState.Blocked,
         ["Done"] = TaskState.Done,
         ["Review"] = TaskState.Review
@@ -51,14 +48,13 @@ public static class TaskStateHelper
     {
         ["Backlog"] = "Offen",
         ["In progress"] = "In Bearbeitung",
-        ["Delegated"] = "Delegiert",
         ["Review"] = "Review",
         ["Blocked"] = "Blockiert",
         ["Done"] = "Erledigt"
     };
 
     /// <summary>Valid task-state string values for API validation.</summary>
-    public static readonly string[] AllStates = ["Backlog", "In progress", "Delegated", "Blocked", "Done", "Review"];
+    public static readonly string[] AllStates = ["Backlog", "In progress", "Blocked", "Done", "Review"];
 
     /// <summary>Convert a TaskState enum to its API string representation.</summary>
     public static string ToStateString(this TaskState state) => StateToString[state];
@@ -87,7 +83,7 @@ public static class TaskStateHelper
     /// Returns true if the caller is allowed to change this task's state.
     /// POLICY:
     ///   - **Iris und Bao** dürfen Status ändern / verschieben.
-    ///   - Sub-agents (programmer, reviewer, architekt) dürfen NIEMALS Status ändern.
+    ///   - Sub-agents (programmer, reviewer, architekt, researcher, executor) dürfen NIEMALS Status ändern.
     ///   - 'nexus-system' ist ein technischer Fallback für automatische Cron/Reset-Workflows.
     ///   - Jeder andere (unbekannt, leer) wird abgewiesen.
     /// </summary>
@@ -96,7 +92,7 @@ public static class TaskStateHelper
         var caller = callerAgent?.Trim().ToLowerInvariant() ?? "";
 
         // Sub-agents must never move state
-        var subAgents = new HashSet<string> { "programmer", "reviewer", "architekt" };
+        var subAgents = new HashSet<string> { "programmer", "reviewer", "architekt", "researcher", "executor" };
         if (subAgents.Contains(caller)) return false;
 
         // Technischer Fallback: nur für interne System-Operationen (Cron, ResetStale)
@@ -129,7 +125,6 @@ public static class TaskStateHelper
         {
             "backlog" => "offen",
             "in progress" => "inProgress",
-            "delegated" => "delegated",
             "review" => "review",
             "blocked" => "blocked",
             "done" => "done",
@@ -146,7 +141,6 @@ public static class TaskStateHelper
         {
             "offen" => "Backlog",
             "inprogress" => "In progress",
-            "delegated" => "Delegated",
             "review" => "Review",
             "blocked" => "Blocked",
             "done" => "Done",