fix: resolve syntax error and implement coordinator API contract tests

coordinator/src/persistence/orders-repo.ts

@@ -595,24 +595,4 @@ function deriveTransitions(status: OrderStatus): string[] {
     default:
       return [status];
   }
-
-  async getMetrics(): Promise<OrderMetrics> {
-    const byStatus = await this.all<{ status: string; count: number }>(this.metricsByStatus);
-    const totalRow = await this.get<{ count: number }>(this.metricsTotal);
-    const lastUpdatedRow = await this.get<{ ts: number | null }>(this.metricsLastUpdated);
-
-    const statusMap: Record<string, number> = {};
-    for (const row of byStatus) {
-      statusMap[row.status] = Number(row.count);
-    }
-
-    return {
-      totalOrders: Number(totalRow?.count ?? 0),
-      byStatus: statusMap,
-      completedOrders: statusMap["completed"] ?? 0,
-      refundedOrders: statusMap["refunded"] ?? 0,
-      staleExpiredOrders: (statusMap["expired"] ?? 0) + (statusMap["failed"] ?? 0),
-      lastUpdatedTimestamp: lastUpdatedRow?.ts != null ? Number(lastUpdatedRow.ts) : null
-    };
-  }
 }

coordinator/src/server/routes/orders.ts

@@ -131,6 +131,21 @@ export function ordersRoutes(orders: OrderService): Router {
   });
 
   // Parameterized routes come AFTER specific routes
+  router.get("/orders/:id/transitions", async (req, res, next) => {
+    const id = req.params.id;
+    try {
+      const order = await orders.get(id);
+      if (!order) {
+        res.status(404).json({ error: "not_found" });
+        return;
+      }
+      const history = await orders.getTransitions(id);
+      res.json({ transitions: history });
+    } catch (err) {
+      next(err);
+    }
+  });
+
   router.get("/orders/:id", async (req, res, next) => {
     const id = req.params.id;
     try {