Recommend that we deprecate the tag policy and use the tag site-policy That will enable searching on site-policy to return posts that articulate the policy and culture of H:SE. That, in turn, will make it easier to refer new users to authoritative reference posts on H:SE policy.
(unless someone can identify a reason to have two overlapping tags. I don't want to maintain questions about policies other than H:SE site policy.)
Unless there is an objection, I'll go through and add site-policy to all questions tagged policy As time permits, we'll remove the old tag. I've updated the tag wiki.
May need to move this to a second question, but we probably should devise some protocol to identify site-policy under discussion vs consensus site-policy. The simple approach would be to use the tag discussion, and remove it after a week of no new content. Then re-add it if/when someone raises a question. Please submit feedback and/or alternatives in answers below.