fix(codex): update silent-hang workaround hint

tests/run_agent/test_codex_silent_hang_hint.py

@@ -3,7 +3,8 @@
 The helper substitutes an actionable hint into the stale-call timeout
 warning when the request matches a known Codex silent-reject pattern
 (gpt-5.5 family on the ChatGPT Codex backend).  See issue #21444 for
-symptom history.
+symptom history. The recommended workaround for ChatGPT Codex OAuth
+accounts is `gpt-5.4` / `gpt-5.3-codex`, not `gpt-5.4-codex`.
 """
 
 from __future__ import annotations
@@ -43,6 +44,8 @@ def test_hint_fires_for_bare_gpt_5_5_on_codex(tmp_path):
     agent.api_mode = "codex_responses"
     hint = agent._codex_silent_hang_hint(model="gpt-5.5")
     assert hint is not None
+    assert "gpt-5.4" in hint
+    assert "gpt-5.3-codex" in hint
     assert "gpt-5.4-codex" in hint
     assert "fallback chain" in hint
 
@@ -72,11 +75,11 @@ def test_hint_fires_when_model_arg_omitted(tmp_path):
 # ── negative cases: hint stays None ────────────────────────────────────────
 
 
-def test_hint_skipped_for_gpt_5_4_codex(tmp_path):
-    """gpt-5.4-codex is the recommended workaround — must not trigger."""
-    agent = _make_agent(tmp_path, model="gpt-5.4-codex")
+def test_hint_skipped_for_gpt_5_4(tmp_path):
+    """gpt-5.4 is the recommended workaround — must not trigger."""
+    agent = _make_agent(tmp_path, model="gpt-5.4")
     agent.api_mode = "codex_responses"
-    assert agent._codex_silent_hang_hint(model="gpt-5.4-codex") is None
+    assert agent._codex_silent_hang_hint(model="gpt-5.4") is None
 
 
 def test_hint_skipped_for_gpt_5_50_false_positive(tmp_path):
@@ -107,11 +110,11 @@ def test_hint_skipped_for_non_codex_provider(tmp_path):
 
 def test_hint_skipped_for_empty_model(tmp_path):
     """Explicit empty string ``model`` short-circuits the regex."""
-    agent = _make_agent(tmp_path, model="gpt-5.4-codex")  # self.model non-matching
+    agent = _make_agent(tmp_path, model="gpt-5.4")  # self.model non-matching
     agent.api_mode = "codex_responses"
     # Explicit empty string: regex won't match
     assert agent._codex_silent_hang_hint(model="") is None
-    # model=None falls back to self.model which is gpt-5.4-codex, also no match
+    # model=None falls back to self.model which is gpt-5.4, also no match
     assert agent._codex_silent_hang_hint(model=None) is None