[MISC] Make HIBF agents copyable

[eseiler]

IBF agents are copyconstructible and copyassignable, but HIBF agents are not.

[vercel]

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Name	Status	Preview	Updated (UTC)
hibf	✅ Ready (Inspect)	Visit Preview	Jul 12, 2024 4:24pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.67%. Comparing base (36d2d19) to head (addbf25).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #211   +/-   ##
=======================================
  Coverage   99.67%   99.67%           
=======================================
  Files          47       47           
  Lines        1852     1857    +5     
  Branches        5        5           
=======================================
+ Hits         1846     1851    +5     
  Misses          6        6           

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[smehringer]

Just thinking out loud:

copy constructible means

auto new_agent = other_agent;

right?

I think I agree that this should be possible.
But can you add a test?
To check if the result buffer has the correct size?