feat(KB-082): complete Step 3 — Clear error on retry

packages/core/src/types.ts

@@ -148,13 +148,11 @@ export interface Task {
   validatorModelId?: string;
   /** Number of merge retry attempts made for this task (auto-merge conflict recovery) */
   mergeRetries?: number;
-  /** Error message from the last failure, if task status is 'failed' */
+  /** Error message from the last failure, if the task failed during execution */
   error?: string;
   /** ISO-8601 timestamp of when the task last entered its current column.
    *  Used to sort cards within a column so that recently-moved cards appear at the top. */
   columnMovedAt?: string;
-  /** Error message from the last failure, if the task failed during execution */
-  error?: string;
   createdAt: string;
   updatedAt: string;
 }