feat(ops): enforce English-only replies and localize netx protocol labels

Append english_output_guard when lang=en, strengthen ops/generalist EN role prompts,
pass NETX_TOOL_LANG into netx tools, and map Chinese protocol buckets to English.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_english_output_guard.py

@@ -0,0 +1,17 @@
+import unittest
+
+from runtime.english_output_guard import english_output_guard_for_lang
+
+
+class EnglishOutputGuardTests(unittest.TestCase):
+    def test_en_returns_guard(self) -> None:
+        g = english_output_guard_for_lang("en")
+        self.assertIn("English-only", g)
+        self.assertIn("CJK", g)
+
+    def test_zh_empty(self) -> None:
+        self.assertEqual(english_output_guard_for_lang("zh"), "")
+
+
+if __name__ == "__main__":
+    unittest.main()