[agents] Update review guidelines for TODOs

[joshlf]

Addresses #2966 (comment)

[gemini-code-assist]

Summary of Changes

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This pull request updates the code review guidelines to provide specific instructions on how to interpret and review TODO comments that are used as temporary placeholders for safety-related justifications and documentation. The aim is to streamline the review process by preventing premature flagging of these specific TODO types, ensuring reviewers understand their intended temporary nature.

Highlights

• Updated Review Guidelines for TODOs: A new guideline has been added to clarify how reviewers should handle TODO comments that serve as placeholders for safety justifications (// SAFETY: TODO) and safety documentation (/// TODO within /// # Safety sections). These are now explicitly recognized as valid temporary placeholders and should not be flagged as critical issues or missing documentation.

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[gemini-code-assist]

Code Review

This pull request updates the agent review guidelines to clarify how TODO comments should be handled in safety-related contexts. The added instruction is clear and serves its purpose well. I have one suggestion to improve the formatting of the new text for better readability by using Markdown's code formatting for code snippets.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.02%. Comparing base (36e8abe) to head (049061a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2967   +/-   ##
=======================================
  Coverage   92.02%   92.02%           
=======================================
  Files          19       19           
  Lines        6029     6029           
=======================================
  Hits         5548     5548           
  Misses        481      481           

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