gh640

Create a GitHub Release for the latest tag in this repository only when the release does not already exist. Use when Codex is asked to publish or backfill a missing Release for the newest `vYYYY.MM.DD` tag, and set the release body from the committed `summaries/YYYY.MM.DD.md` file referenced by that tag.

Copy a generated monthly summary Markdown file from the path the user specifies into this repo, rename it to `summaries/YYYY.MM.DD.md`, then commit, tag, and push. Use when updating this repository with a new monthly summary and releasing it with the existing `vYYYY.MM.DD` tag convention.

Fetch the latest OpenAI model list into CSV and report changes from the previous snapshot in repositories that use `list_models.sh` and `scripts/diff_latest.py`. Use when the user asks to refresh model snapshots, compare with the last run, or summarize added/removed model IDs.