Add Codex Day 0 agent roles

[chadvoegele]

What does this PR do?

Type of change: ? new feature

Adding sub-agent definition for Day 0 workflows.

Usage

Tell your agent "Use the modelopt_model_quantizer agent to quantize the model"

Testing

Ran a trial using Qwen-2.5.

Before your PR is "Ready for review"

Make sure you read and follow Contributor guidelines and your commits are signed (git commit -s -S).

Make sure you read and follow the Security Best Practices (e.g. avoiding hardcoded trust_remote_code=True, torch.load(..., weights_only=False), pickle, etc.).

• Is this change backward compatible?: ✅
• If you copied code from any other sources or added a new PIP dependency, did you follow guidance in CONTRIBUTING.md: ✅
• Did you write any new necessary tests?: ✅
• Did you update Changelog?: ✅ / ❌ / N/A
• Did you get Claude approval on this PR?: ✅ / ❌ / N/A

Additional Information

See design doc.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.38%. Comparing base (7d5d3f9) to head (ab59c72).

Additional details and impacted files

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##             main    #2006   +/-   ##
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  Coverage   78.38%   78.38%           
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  Files         518      518           
  Lines       58269    58269           
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  Hits        45674    45674           
  Misses      12595    12595           

Flag	Coverage Δ
unit	54.86% <ø> (ø)

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