Fix grammatical error in AGENTS.md join paragraph

Author: mrbiggred

AGENTS.md

@@ -6,7 +6,7 @@ Weekly Dev Chat website — MkDocs Material static site. Read `mkdocs.yml` and r
 
 - Posts are for Tuesdays (the weekly chat day). Use next Tuesday's date unless told otherwise.
 - End post body with this paragraph (before the image):
-  `Everyone and anyone are welcome to [join](https://weeklydevchat.com/join/) as long as you are kind, supportive, and respectful of others. Zoom link will be posted at 12pm MDT.`
+  `Everyone and anyone is welcome to [join](https://weeklydevchat.com/join/) as long as you are kind, supportive, and respectful of others. Zoom link will be posted at 12pm MDT.`
 - Place images in the same directory as the post's `index.md`.
 - Use `./create_post.sh` to scaffold a new post (calculates next Tuesday automatically).
 - **Multiple posts on the same date:** If a date folder already has an `index.md`, prefix the filename with a number and dash (e.g., `0-index.md`). The newest/latest post should use the lowest number so it appears first on the homepage. The original `index.md` keeps its name.