Ruby MiniSql vs ActiveRecord benchmark artifact

Files:
- bench_story_compare.rb: benchmark source
- run-local.sh: run with mise-managed Rubies and an existing PostgreSQL database
- run-docker.sh: run Ruby containers against a PostgreSQL container on Docker network bench-net
- results.csv / results.json: measured results used in the article
- chart.svg: visual summary

The benchmark expects a PostgreSQL database with Discourse-like tables: users, topics, posts, categories.
The article describes how the author's runs used a synthetic Discourse SQL Lab database and a subset dump restored into postgres:16 for Docker.