fix: handle subnanosecond in csv file loading

cpp/evalio/types.h

@@ -104,7 +104,9 @@ struct Stamp {
     // extract & pad nsec
     std::string nsec_str = sec_str.substr(dot_pos + 1);
     if (nsec_str.size() > 9) {
-      throw std::runtime_error("Too many digits in fractional part of sec.");
+      // If too many digits, that represents a fraction of a nanosecond
+      // so we just truncate to 9 digits
+      nsec_str = nsec_str.substr(0, 9);
     } else if (nsec_str.size() < 9) {
       nsec_str += std::string(9 - nsec_str.size(), '0');
     }

cpp/setup_pipelines.sh

@@ -87,6 +87,6 @@ if [ ! -d ".vcpkg/" ]; then
     git clone https://github.com/microsoft/vcpkg.git .vcpkg/
 fi
 cd .vcpkg
-git switch --detach 2025.08.27
+git switch --detach 2026.07.29
 cd ..
 ./.vcpkg/bootstrap-vcpkg.sh