feat(mcp): update_task kann isManual setzen + List-Handler stellt seinen Task auf Review

Teil A: update_task bekommt einen optionalen isManual-Parameter (null =
unveraendert); TaskDto/TaskRefDto spiegeln IsManual zurueck.

Teil B: neuer submit_task_for_review MCP-Tool (LifecycleMcpTools) laesst
einen Handler-Task selbst auf WaitingForReview gehen -- fuer einen
worktree-losen Task wird HandlerHeadCommit vom aktuellen HEAD gestempelt,
sonst werden offene Aenderungen committet. Die Submit-Logik ist aus
WorkerHub.SubmitTaskForReview in InteractiveReviewSubmissionService
extrahiert; der Hub ruft sie jetzt nur noch auf. Der Merge-Prompt-Default
weist die Endzweige (merge ohne Rerun, merge_final) an, den eigenen
Handler-Task nach der Summary einzureichen.

src/ClaudeDo.Worker/External/ExternalMcpService.cs

@@ -61,7 +61,8 @@ public sealed record TaskDto(
     // True only while Status is Queued and the picker will not claim this task yet -- either a
     // planning-chain predecessor or DependsOnTaskId hasn't reached Done. See BlockedReason.
     bool Blocked = false,
-    string? BlockedReason = null);
+    string? BlockedReason = null,
+    bool IsManual = false);
 
 // Lean counterpart to TaskDto for writing/status-changing tools: echoes back what changed
 // without re-sending Description/Result, which the caller just sent or already has.
@@ -83,7 +84,8 @@ public sealed record TaskRefDto(
     string? DependsOnTaskId = null,
     bool Blocked = false,
     string? BlockedReason = null,
-    DirtyBaseWarning? BaseDirty = null);
+    DirtyBaseWarning? BaseDirty = null,
+    bool IsManual = false);
 
 // tasks is populated when includeDescription=false (the default): lean references, no
 // Description/Result. tasksFull is populated when includeDescription=true: full tasks incl.
@@ -495,8 +497,8 @@ public sealed class ExternalMcpService
     }
 
     [McpServerTool, Description(
-        "Update an existing task's title, description, commit type, and/or dependsOn link. Pass null to leave a " +
-        "field unchanged." + McpToolDocs.NotWhileRunning + McpToolDocs.LeanTaskRef)]
+        "Update an existing task's title, description, commit type, dependsOn link, and/or manual flag. Pass " +
+        "null to leave a field unchanged." + McpToolDocs.NotWhileRunning + McpToolDocs.LeanTaskRef)]
     public async Task<TaskRefDto> UpdateTask(
         string taskId,
         string? title = null,
@@ -506,6 +508,10 @@ public sealed class ExternalMcpService
                      "string to clear an existing link; null leaves it unchanged. Rejected if it doesn't exist, " +
                      "is this task's own id, or would create a dependency cycle.")]
         string? dependsOnTaskId = null,
+        [Description("true: mark this task as a manual reminder only the user can complete — the queue picker, " +
+                     "daily prep, and the list handler all skip it (a ConPTY session may still touch it). false: " +
+                     "clear the flag. null (default): leave unchanged.")]
+        bool? isManual = null,
         CancellationToken cancellationToken = default)
     {
         taskId = await TaskIdResolver.ResolveAsync(_tasks, taskId, cancellationToken);
@@ -517,6 +523,7 @@ public sealed class ExternalMcpService
         if (title is not null) task.Title = title;
         if (description is not null) task.Description = description;
         if (commitType is not null) task.CommitType = commitType;
+        if (isManual is not null) task.IsManual = isManual.Value;
         await _tasks.UpdateAsync(task, cancellationToken);
 
         if (dependsOnTaskId is not null)
@@ -1743,7 +1750,8 @@ public sealed class ExternalMcpService
         t.Status == TaskStatus.Failed ? t.FailureMaxTurns : null,
         t.DependsOnTaskId,
         blocked,
-        blockedReason);
+        blockedReason,
+        t.IsManual);
 
     private static TaskRefDto ToRefDto(TaskEntity t, bool blocked = false, string? blockedReason = null) => new(
         t.Id,
@@ -1759,7 +1767,9 @@ public sealed class ExternalMcpService
         t.Status == TaskStatus.Failed ? t.FailureMaxTurns : null,
         t.DependsOnTaskId,
         blocked,
-        blockedReason);
+        blockedReason,
+        BaseDirty: null,
+        IsManual: t.IsManual);
 
     // "unknown" covers a Failed task that predates this field (never got a classified reason
     // stamped) — a defined value rather than null so callers don't have to special-case it.