Just wanted to document that I got bedrock working without the /wp subdirectory using the following nginx rules:
rewrite /wp-admin$ $scheme://$host$uri/ last; rewrite ^/(wp-.*.php)$ /wp/$1 last; rewrite ^/(wp-(content|admin|includes).*) /wp/$1 last;
Without the first line, I was having problems logging in even though the urls seemed to rewrite properly.