Add scope-stack builders, URL-context resolver, workspace executor#506

RhysSullivan wants to merge 1 commit intors/cloud-workspaces-04-workspace-crudRhysSullivan/executor:rs/cloud-workspaces-04-workspace-crudfrom

rs/cloud-workspaces-05-url-contextRhysSullivan/executor:rs/cloud-workspaces-05-url-contextCopy head branch name to clipboard