chore: Link more root files in solution

[Flash0ver]

Summary

Add more links to files from the repository root to the Solution file(s).

Remarks

Not sure if it's worth adding all of the suggested files.
As a minimum, I feel that the recently added "AI-files" are useful:

• ./AGENTS.md
• ./agents.toml
• ./warden.toml

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.02%. Comparing base (5b676c4) to head (8282440).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5053      +/-   ##
==========================================
+ Coverage   74.00%   74.02%   +0.02%     
==========================================
  Files         499      499              
  Lines       18048    18048              
  Branches     3512     3512              
==========================================
+ Hits        13356    13360       +4     
+ Misses       3838     3831       -7     
- Partials      854      857       +3     

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