feat(codex-bridge): per-step check with Jev, blocked steps go to a fallback model

User decision (11 Oct 2026): every step of an added model is checked in the
bridge; Jev only passes or blocks; a blocked step is redone by
Uncensored-Uygulama and the next step goes back to the selected model.

The bridge buffers the step's answer, asks Jev four yes/no questions and
decides in code: blocked when the answer refuses or dodges the request, or
changes it with its own conditions without asking; passed when it reports a
concrete technical obstacle, asks the user a question, or has no text (tool
calls only). While buffering the client gets SSE comment lines. Jev unreachable
or fallback unavailable: the first answer is delivered. Codex's own models do
not reach the bridge and are not checked.

Also logs the shape of each forwarded request (not its content): the recurring
"upstream 400" turned out to be Codex's trailing configuration_update item.

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

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

@@ -263,7 +263,7 @@ class Zincir(unittest.TestCase):
             "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,
+            "yarim": yarim, "jev_denetim": __import__("jev_denetim"), "internet": __import__("internet"), "ozet_kopru": ozet_kopru, "OZET_FRENI": ozet_kopru.DonguFreni(), "pencere": pencere,
             "fix_tool_ids": lambda req: 0, "drop_foreign_items": lambda req: 0, "IDE_BILGI": {}, "EXTRA_MODELS": [],
             "arac_semalarini_duzelt": lambda req: 0, "SseRewriter": Mock(), "DEBUG": False, "UA": "test", "RETRIES": 6,
             "UPSTREAM_IDLE_TIMEOUT": 1, "NO_RETRY_PATTERNS": [], "pano_blogunu_ulastir": lambda req: (0, ""),