Update Codex To Gpt-5-Codex

[Kbhat1]

Describe your changes and provide context

• Update Codex to use Gpt-5-Codex
• Use updated login auth method

Testing performed to validate your change

• Verified full pipeline in slack

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Sep 29, 2025, 2:52 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.23%. Comparing base (0e440fb) to head (10fbd88).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #325      +/-   ##
==========================================
+ Coverage   57.01%   57.23%   +0.21%     
==========================================
  Files         255      255              
  Lines       33956    33956              
==========================================
+ Hits        19361    19435      +74     
+ Misses      13053    12986      -67     
+ Partials     1542     1535       -7     

see 16 files with indirect coverage changes

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