fix(routing): avoid full binding rescans in resolveAgentRoute (#36915)

src/routing/resolve-route.test.ts

@@ -1,6 +1,7 @@
-import { describe, expect, test } from "vitest";
+import { describe, expect, test, vi } from "vitest";
 import type { ChatType } from "../channels/chat-type.js";
 import type { OpenClawConfig } from "../config/config.js";
+import * as routingBindings from "./bindings.js";
 import { resolveAgentRoute } from "./resolve-route.js";
 
 describe("resolveAgentRoute", () => {
@@ -768,3 +769,43 @@ describe("role-based agent routing", () => {
     });
   });
 });
+
+describe("binding evaluation cache scalability", () => {
+  test("does not rescan full bindings after channel/account cache rollover (#36915)", () => {
+    const bindingCount = 2_205;
+    const cfg: OpenClawConfig = {
+      bindings: Array.from({ length: bindingCount }, (_, idx) => ({
+        agentId: `agent-${idx}`,
+        match: {
+          channel: "dingtalk",
+          accountId: `acct-${idx}`,
+          peer: { kind: "direct", id: `user-${idx}` },
+        },
+      })),
+    };
+    const listBindingsSpy = vi.spyOn(routingBindings, "listBindings");
+    try {
+      for (let idx = 0; idx < bindingCount; idx += 1) {
+        const route = resolveAgentRoute({
+          cfg,
+          channel: "dingtalk",
+          accountId: `acct-${idx}`,
+          peer: { kind: "direct", id: `user-${idx}` },
+        });
+        expect(route.agentId).toBe(`agent-${idx}`);
+        expect(route.matchedBy).toBe("binding.peer");
+      }
+
+      const repeated = resolveAgentRoute({
+        cfg,
+        channel: "dingtalk",
+        accountId: "acct-0",
+        peer: { kind: "direct", id: "user-0" },
+      });
+      expect(repeated.agentId).toBe("agent-0");
+      expect(listBindingsSpy).toHaveBeenCalledTimes(1);
+    } finally {
+      listBindingsSpy.mockRestore();
+    }
+  });
+});