[Paper Artifact] Equational Reasoning for Probabilistic Programming

[affeldt-aist]

Motivation for this change

This PR is based on PR #912 .

It corresponds to the contents of the following paper: Reynald Affeldt, Yoshihiro Ishiguro, and Zachary Stone. Equational Reasoning for Probabilistic Programming in Rocq. APLAS 2025.

Checklist

• [ ] added corresponding entries in CHANGELOG_UNRELEASED.md

• [ ] added corresponding documentation in the headers

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