Add missing C++ standard library includes

[stanbot8]

Summary

Added explicit #include <cmath> to log_range_param.h and range_param.h. These headers use symbols from <cmath> but relied on transitive includes, which can break with different compilers or standard library versions.

Test plan

• Verify project builds successfully on CI

[sportokalidis]

Hi @stanbot8,

Thanks for the PR!

I checked both headers and they do directly use symbols:

• log_range_param.h uses std::pow(...) and std::round(...)
• range_param.h uses std::round(...)

So adding an explicit #include <cmath> here makes sense.

Could you also add a short note on whether you hit a concrete build failure? That context would be helpful for the PR history.

[sportokalidis]

Hi @stanbot8, the CI issue that prevented macos-system-ci and ubuntu-system-ci from running has been fixed on main.

Could you please update your PR branch with the latest main (merge main into your branch, or rebase onto main) and push?
That should trigger the missing system CI workflows on this PR.

[stanbot8]

Hi @sportokalidis, I've rebased all my open PRs onto the latest main. CI should be able to run on them now.

[sportokalidis]

Looks good to me. Thanks for your contribution!