feat(manager-core): admin is implicit app_admin; delete-script needs AppAdmin

Aligns the canonical capability rules with how the dashboard now shadows
its UI. Instance admins become implicit app_admin on every app (only
InstanceManageSettings stays owner-only), and the script-delete handler
moves from AppWriteScript to AppAdmin so editors can save but not delete.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/manager-core/src/authz.rs

@@ -199,21 +199,14 @@ async fn role_grants(
     }
 }
 
-/// Admin is implicit `editor` on every app (per blueprint §11.6). They
-/// can create apps and manage users, but NOT touch instance-wide
-/// settings or take app-admin-only actions on apps they're not
-/// explicitly app_admin of. Everything not in this set falls through
-/// to deny (`InstanceManageSettings`, `AppManageDomains`, `AppAdmin`).
+/// Admin is implicit `app_admin` on every app (per blueprint §11.6).
+/// They can create apps, manage users, and take any app-scoped action
+/// on any app without an explicit `app_members` row — single-human
+/// installs would otherwise need to add themselves to every new app.
+/// Only `InstanceManageSettings` (sandbox ceiling, etc.) stays
+/// owner-only.
 const fn admin_grants(cap: Capability) -> bool {
-    matches!(
-        cap,
-        Capability::InstanceCreateApp
-            | Capability::InstanceManageUsers
-            | Capability::AppRead(_)
-            | Capability::AppWriteScript(_)
-            | Capability::AppWriteRoute(_)
-            | Capability::AppLogRead(_)
-    )
+    !matches!(cap, Capability::InstanceManageSettings)
 }
 
 /// Member has zero instance authority. App authority requires an
@@ -357,10 +350,23 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn admin_cannot_manage_instance_settings_or_app_admin_actions() {
+    async fn admin_cannot_manage_instance_settings() {
+        let repo = InMemoryAuthzRepo::default();
+        let p = principal(InstanceRole::Admin);
+        assert_eq!(
+            can(&repo, &p, Capability::InstanceManageSettings)
+                .await
+                .unwrap(),
+            Decision::Deny,
+        );
+    }
+
+    #[tokio::test]
+    async fn admin_is_implicit_app_admin_on_every_app() {
         let repo = InMemoryAuthzRepo::default();
         let p = principal(InstanceRole::Admin);
         let app = AppId::new();
+        // Instance-scoped allowances.
         assert_eq!(
             can(&repo, &p, Capability::InstanceCreateApp).await.unwrap(),
             Decision::Allow,
@@ -371,36 +377,22 @@ mod tests {
                 .unwrap(),
             Decision::Allow,
         );
-        assert_eq!(
-            can(&repo, &p, Capability::InstanceManageSettings)
-                .await
-                .unwrap(),
-            Decision::Deny,
-        );
-        // Editor-like grants succeed
-        assert_eq!(
-            can(&repo, &p, Capability::AppWriteScript(app))
-                .await
-                .unwrap(),
-            Decision::Allow,
-        );
-        assert_eq!(
-            can(&repo, &p, Capability::AppWriteRoute(app))
-                .await
-                .unwrap(),
-            Decision::Allow,
-        );
-        // App-admin grants do not
-        assert_eq!(
-            can(&repo, &p, Capability::AppManageDomains(app))
-                .await
-                .unwrap(),
-            Decision::Deny,
-        );
-        assert_eq!(
-            can(&repo, &p, Capability::AppAdmin(app)).await.unwrap(),
-            Decision::Deny,
-        );
+        // Editor-like + app-admin grants both succeed without any
+        // app_members row.
+        for cap in [
+            Capability::AppRead(app),
+            Capability::AppWriteScript(app),
+            Capability::AppWriteRoute(app),
+            Capability::AppLogRead(app),
+            Capability::AppManageDomains(app),
+            Capability::AppAdmin(app),
+        ] {
+            assert_eq!(
+                can(&repo, &p, cap).await.unwrap(),
+                Decision::Allow,
+                "admin denied app-scoped capability {cap:?}"
+            );
+        }
     }
 
     #[tokio::test]
@@ -474,6 +466,29 @@ mod tests {
         );
     }
 
+    /// Editors hold `AppWriteScript` (Save) but **not** `AppAdmin`
+    /// (Delete). The script-delete handler gates on the latter so the
+    /// API can't be tricked into letting an editor remove the script
+    /// they were only allowed to edit.
+    #[tokio::test]
+    async fn editor_can_write_scripts_but_not_delete_them() {
+        let repo = InMemoryAuthzRepo::default();
+        let p = principal(InstanceRole::Member);
+        let app = AppId::new();
+        repo.grant(p.user_id, app, AppRole::Editor).await;
+
+        assert!(can(&repo, &p, Capability::AppWriteScript(app))
+            .await
+            .unwrap()
+            .is_allow());
+        // Delete is gated on AppAdmin in the handler — editors must be
+        // denied here for that gate to bite.
+        assert_eq!(
+            can(&repo, &p, Capability::AppAdmin(app)).await.unwrap(),
+            Decision::Deny,
+        );
+    }
+
     #[tokio::test]
     async fn member_with_app_admin_role_can_do_app_admin_actions() {
         let repo = InMemoryAuthzRepo::default();