Ten tools the console lacked for the actions a review and a merge leave behind: close or reopen a
pull request whose work landed elsewhere, change its title or body, read its files, its diff and its
comments, reopen an issue, read one file at a ref, list branches, delete the branch a closed pull
request leaves. Each is the client's own call; `gitea_api` stays the escape hatch for the rest.
Tested against the fake forge through the compiled tools, the way the console calls them (13/13).