feat(codex-bridge): tell the model the chat model can be changed by saying so; a nameless command asks which

Measured in a live voice chat: asked whether it could change the model, Opus answered "I cannot change this
chat's model here". Every request now carries one short developer note, and "modeli değiştir" without a
name is answered by the bridge with how to say it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/assets/codex-bridge/test_denetim_ek.py

@@ -258,7 +258,7 @@ class Zincir(unittest.TestCase):
             "time": types.SimpleNamespace(sleep=lambda s: None, time=time.time),
             "urllib": types.SimpleNamespace(request=types.SimpleNamespace(Request=urllib.request.Request, urlopen=Mock()),
                                             error=urllib.error),
-            "decompress": lambda body, enc: body, "MODEL_MAP": {}, "ROUTES": {}, "CFG": {}, "log": lambda m: None,
+            "decompress": lambda body, enc: body, "MODEL_MAP": {}, "ROUTES": {}, "CFG": {"model_bilgi": False}, "log": lambda m: None,
             "model_gecis": model_gecis, "YONLENDIRME": model_gecis.Yonlendirme(None), "bilinen_modeller": lambda: MODELS,
             "model_adi": lambda slug: dict(MODELS).get(slug, slug), "is_hatti": is_hatti, "GORULEN_ISTEMCI": set(),
             "yarim": yarim, "ozet_kopru": ozet_kopru, "OZET_FRENI": ozet_kopru.DonguFreni(), "pencere": pencere,