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>

icons/wordmark-dark.svg

@@ -0,0 +1,12 @@
+<svg viewBox="0 0 520 80" xmlns="http://www.w3.org/2000/svg">
+  <!-- A-frame lettermark -->
+  <line x1="28" y1="8" x2="6" y2="68" stroke="#3B82F6" stroke-width="3.5" stroke-linecap="round"/>
+  <line x1="28" y1="8" x2="50" y2="68" stroke="#3B82F6" stroke-width="3.5" stroke-linecap="round"/>
+  <line x1="14" y1="46" x2="42" y2="46" stroke="#3B82F6" stroke-width="2.5" stroke-linecap="round"/>
+  <circle cx="28" cy="8" r="4" fill="#3B82F6"/>
+  <circle cx="14" cy="46" r="2.5" fill="#EF4444"/>
+  <circle cx="28" cy="46" r="2.5" fill="#3B82F6"/>
+  <circle cx="42" cy="46" r="2.5" fill="#EF4444"/>
+  <!-- "rmature" text -->
+  <text x="58" y="62" fill="#dddddd" font-family="-apple-system, system-ui, 'Segoe UI', sans-serif" font-size="52" font-weight="300" letter-spacing="1">rmature</text>
+</svg>