fix: return infinity for hypot overflow

[bhagy-patel1]

Summary

Fixes #137

Previously, ccm::hypot returned the largest finite floating-point value
when the true result exceeded the representable range, instead of returning
+inf like std::hypot does.

Changes

• Added an overflow check in hypot_impl.hpp before the final multiply:
  if x > max / scale, return +inf directly
• Added #include <limits> required for the overflow check
• Added a regression test HypotOverflowBoundary in hypot_cbrt_test.cpp

Note

This PR replaces #141, which was closed due to merge conflicts with the
updated main branch. The branch has been rebased onto the latest main.