chore: simplify model flag handling

codex_telegram_bridge/src/codex_telegram_bridge/exec_bridge.py

@@ -359,23 +359,7 @@ def run(
     else:
         extra_args = shlex.split(str(raw_exec_args))  # e.g. "--full-auto --search"
 
-    def _strip_model_args(args: list[str]) -> list[str]:
-        stripped: list[str] = []
-        i = 0
-        while i < len(args):
-            arg = args[i]
-            if arg in ("--model", "-m"):
-                i += 2
-                continue
-            if arg.startswith("--model=") or arg.startswith("-m="):
-                i += 1
-                continue
-            stripped.append(arg)
-            i += 1
-        return stripped
-
     if model:
-        extra_args = _strip_model_args(extra_args)
         extra_args.extend(["--model", model])
 
     def _has_notify_override(args: list[str]) -> bool: