feat(openai): add gpt-5.4 support for API and Codex OAuth (#36590)

* feat(openai): add gpt-5.4 support and priority processing

* feat(openai-codex): add gpt-5.4 oauth support

* fix(openai): preserve provider overrides in gpt-5.4 fallback

* fix(openai-codex): keep xhigh for gpt-5.4 default

* fix(models): preserve configured overrides in list output

* fix(models): close gpt-5.4 integration gaps

* fix(openai): scope service tier to public api

* fix(openai): complete prep followups for gpt-5.4 support (#36590) (thanks @dorukardahan)

---------

Co-authored-by: Tyler Yust <TYTYYUST@YAHOO.COM>

docs/start/wizard-cli-reference.md

@@ -143,7 +143,7 @@ What you set:
   <Accordion title="OpenAI Code subscription (OAuth)">
     Browser flow; paste `code#state`.
 
-    Sets `agents.defaults.model` to `openai-codex/gpt-5.3-codex` when model is unset or `openai/*`.
+    Sets `agents.defaults.model` to `openai-codex/gpt-5.4` when model is unset or `openai/*`.
 
   </Accordion>
   <Accordion title="OpenAI API key">