upgrade: adopt V8.34.1 (multi-image banner carousel + spec-table source modes)

Plain overlay (33 items, same-source lineage, zero patch replay).
Theme suites 35/35; full run 453 passed + 10 known Windows env fails
(suspect-module rerun confirms identical failure set).
Live: container 8.34.1-dev.1; hesupipe home leftover industrial-preset
blocks cleared via studio draft+publish flow — home now renders pure
trade-pro template (sf-section/Chinese blocks = 0).

Co-Authored-By: Claude Code <noreply@anthropic.com>

reports/v8341/summary.json

@@ -0,0 +1,21 @@
+{
+  "version": "8.34.1-dev.1",
+  "python_tests_passed": 464,
+  "python_groups_passed": 20,
+  "javascript_tests_passed": 40,
+  "browser_widths_checked": [
+    1440,
+    1024,
+    820,
+    430,
+    390,
+    375
+  ],
+  "http_worker_e2e": "passed",
+  "known_production_gaps": [
+    "art_design_pro_official_integration",
+    "postgres_redis_multiworker_production",
+    "real_remote_deploy_and_rollback",
+    "authenticated_full_studio_browser_e2e"
+  ]
+}