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/components/layout/Sidebar.tsx

@@ -1,8 +1,8 @@
 import { useCallback, useEffect, useState } from 'react'
 import { useLocation } from 'react-router-dom'
 import {
-  LayoutGrid, Network, Wrench, Clock, FileOutput, BarChart3,
-  Settings, PanelLeftClose, PanelLeftOpen, MessageSquareText,
+  LayoutGrid, Network, Wrench, Clock, FileOutput, BarChart3, TrendingUp,
+  Settings, PanelLeftClose, PanelLeftOpen, MessageSquareText, ListChecks,
   BookOpen, Lightbulb, Code2, Library, Brain, WandSparkles, Sparkles, AlertTriangle,
 } from 'lucide-react'
 import { cn } from '@/lib/utils'
@@ -94,8 +94,10 @@ export function Sidebar() {
             <NavItem href="/flow-assist" icon={WandSparkles} label="Flow Assist" iconColor={NAV_COLORS.flowAssist} collapsed />
             <NavItem href="/step-library" icon={Library} label="Step Library" iconColor={NAV_COLORS.stepLib} collapsed />
             <NavItem href="/kb-accelerator" icon={Lightbulb} label="KB Accelerator" iconColor={NAV_COLORS.kb} collapsed />
+            <NavItem href="/review-queue" icon={ListChecks} label="Review Queue" iconColor="#fbbf24" collapsed />
             <NavItem href="/shares" icon={FileOutput} label="Exports" iconColor={NAV_COLORS.exports} collapsed />
             <NavItem href="/analytics" icon={BarChart3} label="Analytics" iconColor={NAV_COLORS.analytics} collapsed />
+            <NavItem href="/analytics/flowpilot" icon={TrendingUp} label="FlowPilot Analytics" iconColor="#2dd4bf" collapsed />
             <NavItem href="/guides" icon={BookOpen} label="User Guides" iconColor={NAV_COLORS.guides} collapsed />
             <NavItem href="/feedback" icon={MessageSquareText} label="Feedback" iconColor={NAV_COLORS.feedback} collapsed />
           </div>
@@ -161,6 +163,7 @@ export function Sidebar() {
             <NavItem href="/flow-assist" icon={WandSparkles} label="Flow Assist" iconColor={NAV_COLORS.flowAssist} />
             <NavItem href="/step-library" icon={Library} label="Step Library" iconColor={NAV_COLORS.stepLib} />
             <NavItem href="/kb-accelerator" icon={Lightbulb} label="KB Accelerator" iconColor={NAV_COLORS.kb} />
+            <NavItem href="/review-queue" icon={ListChecks} label="Review Queue" iconColor="#fbbf24" />
 
             {/* Insights */}
             <div className="font-label text-[0.5625rem] uppercase tracking-[0.12em] text-[#5a6170] px-3 pt-3 pb-1">
@@ -168,6 +171,7 @@ export function Sidebar() {
             </div>
             <NavItem href="/shares" icon={FileOutput} label="Exports" iconColor={NAV_COLORS.exports} />
             <NavItem href="/analytics" icon={BarChart3} label="Analytics" iconColor={NAV_COLORS.analytics} />
+            <NavItem href="/analytics/flowpilot" icon={TrendingUp} label="FlowPilot Analytics" iconColor="#2dd4bf" />
           </div>
         </>
       )}