Get an organization

Organization owners and cluster admins (`org.manage`). Asynchronous and resumable, like a team's deletion: the organization turns `deleting` at once (it takes no writes: 409 `org-deleting`; its teams answer 409 `team-deleting`), and the operation `org.delete` (target `/orgs/<id>`) deletes each of its teams with the team cascade (workspaces purged at once, managed services, registries, domains, git access defaults, shared vaults, namespace), then the organization with its memberships and invitations. Audit rows stay. Every member loses access when the deletion starts. Deleting a deleting organization returns its operation. The console asks to type the organization's name first. The installation's default organization (`tenancy.defaultOrg`) can be deleted too; core creates it again, empty, at its next start. When a team's deletion gives up, the operation fails with the problem `org-delete-failed`, whose `failed_team` names the team and why; the organization stays `deleting` and nothing polls any more. Deleting it again is the *Retry*: it answers a new `org.delete` operation (`Org.delete_operation_id` changes), restarts the failed team deletions (each with a new `team.delete` operation) and resumes the organization's.