Artifact for the paper "Persistent Iterators with Value Semantics"

The version of the artifact reviewed by PLDI 2026 AEC, including Docker images for libfpp in linux/amd64 and linux/arm64 architectures, together with a README that details the Getting Started Guide and the Step-by-Step Instructions for artifact evaluation. It also includes a tarball of the libfpp project source as of commit a4414bf. The Docker image corresponds to the SHA256 digest version 2471745b74, which contains the contents of the libfpp project as of commit a4414bf together with the built binaries for testing.