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).
⚠️ Report is 26 commits behind head on main.

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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[Flash0ver]

question: Worth adding all of these?

Not sure if we should indeed add all of these files ... or only the most prevalent files, that we are also likely to edit frequently.

Since I am using "Find in Files" quite a lot in Rider, which only includes Solution-included files, and not the entire repo's "File System", I thought about adding them all.

[jamescrosswell]

Worth adding them for convenience I think.