fix(codex-bridge): audit findings: visible permanent errors, stricter model command, unbuffered stream

From ten independent read-only audits (11 Oct 2026), verified against the code:
- a permanent gateway error (no tools, 401/402/403, bare upstream 400) ends the turn with a visible
  assistant message instead of a silent retry and an empty turn;
- "modeli ... yapma", "X modeli için test yap" and general "hangi model ..." questions are no longer
  commands; a name whose version does not fit, or that several models share, is asked back;
- the stream is forwarded as it arrives (read1) and an upstream drop is no longer logged as a client
  stop nor saved as an interrupted answer;
- a lone "." joining a running turn is removed without the hook messages after it;
- the interrupted-answer note finds the user message behind hook messages and detects completion
  by event type; a per-minute rate limit is not learned as a context window.

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

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

@@ -48,7 +48,15 @@ class Izleyici:
                         if d.get("type") == "response.output_text.delta" and isinstance(d.get("delta"), str):
                             self.parcalar.append(d["delta"])
             elif b"response.completed" in blok or b"response.failed" in blok or b"response.incomplete" in blok:
-                self.bitti = True
+                # Bitis, olayin TURUNDEN anlasilir; arac argumaninda gecen "response.completed" sozu bitis degildir.
+                for satir in blok.split(b"\n"):
+                    if satir.startswith(b"data:"):
+                        try:
+                            tur = json.loads(satir[5:]).get("type")
+                        except (ValueError, AttributeError):
+                            continue
+                        if tur in ("response.completed", "response.failed", "response.incomplete"):
+                            self.bitti = True
 
     @property
     def metin(self):
@@ -89,7 +97,12 @@ def uygula(req, anahtar, simdi=None):
     girdi = req.get("input")
     if not kayit or not isinstance(girdi, list) or not girdi:
         return 0
-    son = girdi[-1]
+    son = None
+    for oge in reversed(girdi):     # kancalarin kullanici mesajinin ardina ekledigi talimat mesajlari atlanir
+        if isinstance(oge, dict) and oge.get("type", "message") == "message" and oge.get("role") in ("developer", "system"):
+            continue
+        son = oge
+        break
     if not (isinstance(son, dict) and son.get("type", "message") == "message" and son.get("role") == "user"):
         return 0            # sikistirma istegi, arac sonucu turu vb.: yeni kullanici mesajini bekle
     metin = kayit["metin"]