Should this include@iritkatriel and a few others from Microsoft too?

No, not me.

Please let me know if I miss someone at Microsoft team.
cc@Fidget-Spinner

Not sure about this, I think there are too many contributors to try listing them exhaustively. Maybe go with something like "Sam Gross and many others"?

Disclaimer: As the person listed in the description, I am biased, so I have no opinions about it.

But listing people as possible can give motivation to work projects not only for this but also other projects. For the faster-cpython project,they listed as many people as possible, so it was a great honor for me, and it motivated me to participate in other projects.
(And It can also be a good reference for persuading a company to let people work part-time on the CPython project.)

"Sam Gross and many others"?

I think this is the minimum option that should be used if there is controversy regarding this.

And I also think there should be more people on the list. Please let me know or have the person update the description with more details.
(I just picked people with free-threading labels)

I can't speak for the MS team because I'm also not employed by them :) but IMO/IIUC the MS team is focused on single-threaded JIT performance mostly. So they werent much involved in the 3.13 free threaded effort, apart from discussions and design help we received from them, which I'm thankful for.

Wording suggestions (on mobile so I can't easily check line wrapping)

Thanks, it's more better, and@itamaro is going to add more detail by next week :)