feat(knowledge-flywheel): add Phase 3 Knowledge Flywheel — AI analysis, review queue, analytics

Phase 3 implementation:
- AI session analysis service that generates flow proposals from resolved sessions
- APScheduler job for batch processing pending analyses (max_instances=1)
- Knowledge gap detection (weak options, high escalation signals)
- Flow proposals CRUD with team admin review workflow (approve/edit/dismiss/reject)
- FlowPilot analytics dashboard with confidence tiers, PSA metrics, knowledge gaps
- In-session script generator component
- Review queue page with filtering and proposal detail panel

Bug fixes from review (12 total):
- Fix "Edit & Publish" navigating to non-existent /editor/new route
- Hide Approve button for enhancement proposals (require Edit & Publish)
- Add max_instances=1 to scheduler to prevent TOCTOU race
- Fix eventual_success case() double-counting failed retries
- Add tree_structure validation before creating tree from proposal
- Simplify script generator rendering condition
- Add severity style fallback, toFixed on rates, Link instead of <a href>
- Add toast.warning on dismiss failure, fix dedup for domain-less sessions
- Cast Decimal to int in knowledge gap evidence dicts

Also updates CLAUDE.md with lessons 67-71 and Phase 3 project structure.

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

frontend/src/router.tsx

@@ -47,6 +47,8 @@ const AssistantChatPage = lazy(() => import('@/pages/AssistantChatPage'))
 const FlowAssistPage = lazy(() => import('@/pages/FlowAssistPage'))
 const FlowPilotSessionPage = lazy(() => import('@/pages/FlowPilotSessionPage'))
 const EscalationQueuePage = lazy(() => import('@/pages/EscalationQueuePage'))
+const ReviewQueuePage = lazy(() => import('@/pages/ReviewQueuePage'))
+const FlowPilotAnalyticsPage = lazy(() => import('@/pages/FlowPilotAnalyticsPage'))
 const KBAcceleratorPage = lazy(() => import('@/pages/KBAcceleratorPage'))
 const GuidesHubPage = lazy(() => import('@/pages/GuidesHubPage'))
 const GuideDetailPage = lazy(() => import('@/pages/GuideDetailPage'))
@@ -174,6 +176,8 @@ export const router = sentryCreateBrowserRouter([
       { path: 'pilot', element: page(FlowPilotSessionPage) },
       { path: 'pilot/:sessionId', element: page(FlowPilotSessionPage) },
       { path: 'escalations', element: page(EscalationQueuePage) },
+      { path: 'review-queue', element: page(ReviewQueuePage) },
+      { path: 'analytics/flowpilot', element: page(FlowPilotAnalyticsPage) },
       { path: 'guides', element: page(GuidesHubPage) },
       { path: 'guides/:slug', element: page(GuideDetailPage) },
       // Admin routes