Document blazectl Download Usage in Agent Instructions

[alexanderkiel]

Closes: #3835

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.23%. Comparing base (2810f86) to head (83ab00b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3837      +/-   ##
==========================================
- Coverage   96.23%   96.23%   -0.01%     
==========================================
  Files         423      423              
  Lines       26478    26478              
  Branches      640      640              
==========================================
- Hits        25481    25480       -1     
  Misses        474      474              
- Partials      523      524       +1     

see 1 file with indirect coverage changes

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