Hi Matthew. If you intend this to be binding, I suggest that you coordinate
this with other work being done by WMF Community Advocacy and Legal. My
hope would be to have a uniform Friendly Space Policy that is a TOS
amendment and applies to all Wikimedia spaces.
A note on IRC channels: these are generally governed by Freenode with the
assistance of volunteers, and not WMF. I imagine that a WMF policy that has
community consensus would be enforced by IRC ops in Wikimedia-themed
channels. In general, I think ops are good at keeping the peace.
Regards,
Pine