dominicrume/cantor8_kya_rails: docs/findings-openzeppelin.md

# Mutation testing three OpenZeppelin Canton repositories Run on 2026-09-07 with [`tools/daml_mutate.py`](../tools/daml_mutate.py), answering the standing invitation in OpenZeppelin's [forum thread](https://forum.canton.network/t/feedback-welcome-openzeppelin-s-daml-development-stack-is-public-and-o