Feat v0.7.0 shell contract + surface audit + rebrand

Two-slot shell topbar (home, left, center, bell, user menu) with SDK API
(setLeft/setSlot/setTitle/hide/show). All 4 primary surfaces migrated:
Settings and Team Admin to Pattern B (flat tabs), Admin to Pattern C
(category tabs + sidebar), Docs to Pattern A (default).

Backend WS events: package.changed (broadcast), auth.changed (targeted),
notification.all_read. User menu re-fetches on package/auth changes.
Bell syncs read state across tabs.

Error handling pass with .sw-inline-error CSS primitive. Empty state
guidance for Admin Workflows/Groups. Announcement global dismiss via
localStorage. Rebrand assets deployed (both b/e icon variants, wordmarks,
full icon library). Docs outline scroll-to-heading fix.

Bug fixes: ICD security assertion tightened, workflow-demo error surfacing,
signoff display names, hello-dashboard + team-admin/groups.js deleted.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/pages/templates/surfaces/admin.html

@@ -5,6 +5,7 @@
 */}}
 
 {{define "surface-admin"}}
+<div id="shell-topbar"></div>
 <div id="admin-mount" class="surface-admin" style="flex-direction:column;">
     {{/* Preact renders into this div. Show a loading state until it mounts. */}}
     <div class="settings-placeholder" style="padding:40px;text-align:center;">Loading admin&hellip;</div>