reconcile and rep ids sorted

fakes.go

@@ -6,8 +6,23 @@ import (
 
 type fakeST struct {
 	dept      string
-	err       error
 	chapterID int64
+	err       error
+
+	agents    map[int64]int64 // userID → existing agent, 0 or absent = none
+	assigned  map[int64]int64 // recorded writes
+}
+
+func (f *fakeST) ActiveAgent(ctx context.Context, userID int64) (int64, error) {
+	return f.agents[userID], nil
+}
+
+func (f *fakeST) AssignAgent(ctx context.Context, userID, agentID int64) error {
+	if f.assigned == nil {
+		f.assigned = map[int64]int64{}
+	}
+	f.assigned[userID] = agentID
+	return nil
 }
 
 func (f *fakeST) GetUser(ctx context.Context, id int64) (*User, error) {