[devmotion]

Fixes #868.

min/max on Dual were generated from DiffRules. Those rules choose the partials by value only, so on a tie in value the result depended on the argument order rather than on isless, which breaks ties on the partials since #695:

julia> x = ForwardDiff.Dual(48.0, 1.0);

julia> min(x, 48.0), min(48.0, x)  # before
(Dual{Nothing}(48.0,1.0), Dual{Nothing}(48.0,0.0))

julia> min(x, 48.0), min(48.0, x)  # after
(Dual{Nothing}(48.0,0.0), Dual{Nothing}(48.0,0.0))

No DiffRules rule can express this tie-breaking, since a rule only sees the values. So this PR stops generating min/max from DiffRules and defines them in terms of isless. Like min/max on floats, they propagate NaN values. Mixed Dual/Real arguments are promoted by Base's min(::Real, ::Real).

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.10%. Comparing base (37a61e1) to head (5875780).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #869      +/-   ##
==========================================
- Coverage   91.17%   91.10%   -0.08%     
==========================================
  Files          11       11              
  Lines        1077     1079       +2     
==========================================
+ Hits          982      983       +1     
- Misses         95       96       +1     

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