Fix/agents instructions

[tig]

Fixes

• Cleans up AGENTS.md
• Fixes Strrings.Designer.cs - commits it

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.37%. Comparing base (12917e5) to head (7406db1).
⚠️ Report is 1 commits behind head on v2_develop.

Additional details and impacted files

@@              Coverage Diff               @@
##           v2_develop    #4590      +/-   ##
==============================================
- Coverage       77.38%   77.37%   -0.02%     
==============================================
  Files             438      438              
  Lines           45212    45212              
  Branches         6440     6440              
==============================================
- Hits            34989    34983       -6     
- Misses           8383     8389       +6     
  Partials         1840     1840              

see 1 file with indirect coverage changes

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