L1RouteGuard wraps the new routes and redirects users without
canUseL1Surface back to /. Page components are stubs in this task
(real UI in T21-T24): L1Dashboard, L1WalkPage, L1DraftsPage,
L1TicketsPage.
Routes: /l1, /l1/walk/:sessionId, /l1/drafts, /l1/tickets — all gated.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
