fix(security): fail closed parsed chat allowlist

src/imessage/targets.test.ts

@@ -71,6 +71,14 @@ describe("imessage targets", () => {
     expect(ok).toBe(true);
   });
 
+  it("denies when allowFrom is empty", () => {
+    const ok = isAllowedIMessageSender({
+      allowFrom: [],
+      sender: "+1555",
+    });
+    expect(ok).toBe(false);
+  });
+
   it("formats chat targets", () => {
     expect(formatIMessageChatTarget(42)).toBe("chat_id:42");
     expect(formatIMessageChatTarget(undefined)).toBe("");