fix(issues): normalize HTML entities in @mention tokens before agent lookup (#1255)

Rich-text comments store entities like   after @names; strip them before matching agents so issue_comment_mentioned and wake injection work.

Made-with: Cursor

server/src/__tests__/normalize-agent-mention-token.test.ts

@@ -0,0 +1,24 @@
+import { describe, expect, it } from "vitest";
+import { normalizeAgentMentionToken } from "../services/issues.ts";
+
+describe("normalizeAgentMentionToken", () => {
+  it("strips hex numeric entities such as space ( )", () => {
+    expect(normalizeAgentMentionToken("Baba ")).toBe("Baba");
+  });
+
+  it("strips decimal numeric entities", () => {
+    expect(normalizeAgentMentionToken("Baba ")).toBe("Baba");
+  });
+
+  it("strips common named entities", () => {
+    expect(normalizeAgentMentionToken("Baba ")).toBe("Baba");
+  });
+
+  it("returns plain names unchanged", () => {
+    expect(normalizeAgentMentionToken("Baba")).toBe("Baba");
+  });
+
+  it("trims after stripping entities", () => {
+    expect(normalizeAgentMentionToken("Baba  ")).toBe("Baba");
+  });
+});