fix(permissions): admin can no longer operate tests — start/submit/edit/create, view only

Admin still bypassed require_any_role (non-strict) on the pure
operator actions: start-execution, submit-red, start-blue-work,
submit-blue, pause/resume-timer, and the red/blue field-edit + general
test create/update/remediation/import-rt/template endpoints all used
the loose dependency even where admin wasn't in the role tuple.
Switched every one of these to require_any_role_strict, matching the
review/validate/dispute/hold/assign endpoints already fixed earlier.

Frontend: removed every remaining role === "admin" disjunct gating
Start Execution, Submit to Blue Team, blue evaluating actions, timer
control, red/blue field editing, test creation, and template creation.
Team-blindness visibility (isBlind) deliberately keeps the admin
bypass — admin still sees both sides unmasked for oversight, since
that's visibility, not operating.

Updated ~20 tests whose fixtures used the admin account as a
convenience shortcut to create/drive tests through the workflow —
switched them to a red_lead account, fixing an incidental
fixture-resolution-order cookie bug along the way (client's cookie
jar prefers the last-logged-in role's cookie over any Bearer header
explicitly passed to a later request).

frontend/src/pages/TestCatalogPage.tsx

@@ -80,9 +80,9 @@ export default function TestCatalogPage() {
   const [searchParams, setSearchParams] = useSearchParams();
   const { user } = useAuth();
 
-  // Only leads and admins can create tests from templates
+  // Only leads can create tests from templates — admin administers the
+  // site, not test content.
   const canUseTemplate =
-    user?.role === "admin" ||
     user?.role === "red_lead" ||
     user?.role === "blue_lead";
 

frontend/src/pages/TestDetailPage.tsx

@@ -519,14 +519,13 @@ export default function TestDetailPage() {
   const role = user?.role ?? "";
   const canSaveRed =
     (test.state === "draft" || test.state === "red_executing") &&
-    (role === "red_tech" || role === "red_lead" || role === "admin");
+    (role === "red_tech" || role === "red_lead");
   const canSaveBlue =
     test.state === "blue_evaluating" &&
-    (role === "blue_tech" || role === "blue_lead" || role === "admin");
+    (role === "blue_tech" || role === "blue_lead");
 
-  // Only leads and admins can create templates
-  const canSaveAsTemplate =
-    role === "red_lead" || role === "blue_lead" || role === "admin";
+  // Only leads can create templates — admin administers the site, not test content.
+  const canSaveAsTemplate = role === "red_lead" || role === "blue_lead";
 
   // ── Render ─────────────────────────────────────────────────────
 

frontend/src/pages/TestsPage.tsx

@@ -139,8 +139,8 @@ export default function TestsPage() {
   const navigate = useNavigate();
   const { user } = useAuth();
 
-  const canCreate =
-    user?.role === "admin" || user?.role === "red_lead" || user?.role === "blue_lead";
+  // Only leads can create tests — admin administers the site, not test content.
+  const canCreate = user?.role === "red_lead" || user?.role === "blue_lead";
 
   const techRole = isTechRole(user?.role);