Built-in Groups admin screen (todo §5); /admin/groups list (search/sort/paginate) + create/delete + membership (add/remove users & nested groups), writing only to Keto — gated admin-only + CSRF-guarded like Users (Kratos read only to label pickers). A group = Keto subject set Group:<name>#members, exists while it has ≥1 member: create writes the first-member tuple, delete removes all by partial-filter. Extracted shared admin-nav.ts (Dashboard·Users·Groups); new generic rowHeader <th scope=row> data-table cell. Stability-reviewer run as a local PR: symmetric subject UUID-validation, duplicate-name rejection, malformed-%→404. 228→237 units + typecheck green; core Keto interactions boot-verified live

views/admin/group-detail.ejs

@@ -0,0 +1,16 @@
+<%#
+  Group admin detail / membership page (todo §5): the group-detail body in the app shell.
+%><%
+  const nav = include("partials/nav-tree", { nodes: model.nav });
+  const body = include("partials/group-detail-body", { add: model.add, csrfToken: model.csrfToken, del: model.delete, error: model.error, group: model.group, members: model.members });
+-%>
+<%- include("partials/shell", {
+  body,
+  brand: model.shell.brand,
+  breadcrumbs: model.shell.breadcrumbs,
+  csrfToken: model.shell.csrfToken,
+  nav,
+  theme: model.shell.theme,
+  title: model.shell.title,
+  user: model.shell.user,
+}) %>