fix(onboarding): preserve emoji in recommendation reasons (#110401)

Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/system-agent/setup-app-recommendations.test.ts

@@ -170,7 +170,7 @@ describe("setup app recommendation matcher", () => {
   });
 
   it("tolerates fenced JSON with extra keys and long reasons", async () => {
-    const reason = `useful ${"very ".repeat(40)}integration`;
+    const reason = `${"a".repeat(118)}🤖suffix`;
     const result = await getSetupAppRecommendations({
       inventorySource,
       runtime: defaultRuntime,
@@ -200,6 +200,7 @@ describe("setup app recommendation matcher", () => {
     expect(result.status).toBe("ok");
     if (result.status === "ok") {
       expect(result.matches[0]?.candidateId).toBe("notes-tools");
+      expect(result.matches[0]?.reason).toBe(`${"a".repeat(118)}…`);
       expect(result.matches[0]?.reason.length).toBeLessThanOrEqual(120);
     }
   });

src/system-agent/setup-app-recommendations.ts

@@ -1,3 +1,4 @@
+import { truncateUtf16Safe } from "@openclaw/normalization-core/utf16-slice";
 import pLimit from "p-limit";
 import { z } from "zod";
 import { searchClawHubSkills } from "../infra/clawhub.js";
@@ -79,7 +80,7 @@ const MatcherOutputSchema = z.object({
         .string()
         .trim()
         .min(1)
-        .transform((value) => (value.length > 120 ? `${value.slice(0, 119)}…` : value)),
+        .transform((value) => (value.length > 120 ? `${truncateUtf16Safe(value, 119)}…` : value)),
     }),
   ),
 });