Address PR review feedback

- Gate e2e-admin superuser behind E2E_MODE env var (security)
- Add status and tag filters to ArticleFilterSet
- Set default_ordering to -published_date on listing viewset
- Add summary to ArticlePage.search_fields for search support
- Add 4 new tests for filters, ordering, and search fields

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

apps/blog/wagtail_hooks.py

@@ -1,4 +1,5 @@
 import django_filters
+from taggit.models import Tag
 from wagtail import hooks
 from wagtail.admin.filters import WagtailFilterSet
 from wagtail.admin.ui.components import Component
@@ -11,6 +12,12 @@ from wagtail.snippets.views.snippets import SnippetViewSet
 from apps.authors.models import Author
 from apps.blog.models import ArticlePage, Category, TagMetadata
 
+STATUS_CHOICES = [
+    ("live", "Published"),
+    ("draft", "Draft"),
+    ("scheduled", "Scheduled"),
+]
+
 
 class TagMetadataViewSet(SnippetViewSet):
     model = TagMetadata
@@ -35,6 +42,17 @@ register_snippet(CategoryViewSet)
 # ── Articles page listing ────────────────────────────────────────────────────
 
 
+class StatusFilter(django_filters.ChoiceFilter):
+    def filter(self, qs, value):  # noqa: A003
+        if value == "live":
+            return qs.filter(live=True)
+        if value == "draft":
+            return qs.filter(live=False, go_live_at__isnull=True)
+        if value == "scheduled":
+            return qs.filter(live=False, go_live_at__isnull=False)
+        return qs
+
+
 class ArticleFilterSet(WagtailFilterSet):
     category = django_filters.ModelChoiceFilter(
         queryset=Category.objects.all(),
@@ -44,6 +62,15 @@ class ArticleFilterSet(WagtailFilterSet):
         queryset=Author.objects.all(),
         empty_label="All authors",
     )
+    status = StatusFilter(
+        choices=STATUS_CHOICES,
+        empty_label="All statuses",
+    )
+    tag = django_filters.ModelChoiceFilter(
+        field_name="tags",
+        queryset=Tag.objects.all(),
+        empty_label="All tags",
+    )
 
     class Meta:
         model = ArticlePage
@@ -66,6 +93,7 @@ class ArticlePageListingViewSet(PageListingViewSet):
         PageStatusColumn("status", sort_key="live"),
     ]
     filterset_class = ArticleFilterSet
+    default_ordering = "-published_date"
 
 
 @hooks.register("register_admin_viewset")