Merge branch 'claudedo/5c80a0aba5d9468a96cf809fc7a6e7a1'

src/ClaudeDo.Worker/State/Interfaces/ITaskStateService.cs

@@ -27,6 +27,10 @@ public interface ITaskStateService
     Task<TransitionResult> BlockOnAsync(string taskId, string predecessorTaskId, CancellationToken ct);
     Task<TransitionResult> UnblockAsync(string taskId, CancellationToken ct);
 
+    // dependsOnTaskId null clears the dependency. Rejects self-reference, an unknown dependency
+    // id, and a link that would create a cycle -- see TaskStateService for the walk.
+    Task<TransitionResult> SetDependsOnAsync(string taskId, string? dependsOnTaskId, CancellationToken ct);
+
     // Surfaces a WaitingForChildren parent for review once all its children are terminal.
     // Best-effort (swallows and logs failures) — safe to call after any child mutation,
     // e.g. deleting the last non-terminal child (no terminal transition fires for a delete).