fix(cookbook): harden remote serve host handling (#4345)

tests/test_codex_ssh_host_validation.py

@@ -68,6 +68,14 @@ def test_valid_remote_builds_port_flag():
     assert port_flag == "-p 2222 "
 
 
+def test_integer_ssh_port_in_stored_task_normalizes_without_crashing():
+    host, port_flag = codex_routes._ssh_prefix_for_task(
+        {"remoteHost": "user@box", "sshPort": 2222}
+    )
+    assert host == "user@box"
+    assert port_flag == "-p 2222 "
+
+
 def test_default_ssh_port_omits_flag():
     host, port_flag = codex_routes._ssh_prefix_for_task(
         {"remoteHost": "box", "sshPort": "22"}