Fix AI job claim returning columns

internal/store/store.go

@@ -26,6 +26,13 @@ scheduled_at, started_at, completed_at, worker_id, heartbeat_at,
 created_at, updated_at, idempotency_key
 `
 
+const jobSelectColumnsFromJobAlias = `
+j.id, j.owner_service, j.owner_ref, j.task_type, j.model_profile, j.priority, j.status,
+j.attempts, j.max_attempts, j.input, j.result, j.error_code, j.error_message,
+j.scheduled_at, j.started_at, j.completed_at, j.worker_id, j.heartbeat_at,
+j.created_at, j.updated_at, j.idempotency_key
+`
+
 func Open(ctx context.Context, databaseURL string) (*Store, error) {
 	if strings.TrimSpace(databaseURL) == "" {
 		return nil, errors.New("DATABASE_URL is required")
@@ -339,7 +346,7 @@ SET status = 'running',
     updated_at = NOW()
 FROM picked
 WHERE j.id = picked.id
-RETURNING ` + jobSelectColumns + `
+RETURNING ` + jobSelectColumnsFromJobAlias + `
 `
 	rows, err := s.pool.Query(ctx, q, in.TaskTypes, in.ModelProfiles, in.Limit, workerID)
 	if err != nil {