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/flowpilot/ProposalCard.tsx

@@ -0,0 +1,62 @@
+import { GitBranch, ArrowUpRight, Sparkles, Clock, Hash } from 'lucide-react'
+import type { FlowProposalSummary } from '@/types/flow-proposal'
+
+const TYPE_CONFIG = {
+  new_flow: { label: 'New Flow', color: 'text-emerald-400 bg-emerald-400/10 border-emerald-400/20', icon: Sparkles },
+  enhancement: { label: 'Enhancement', color: 'text-amber-400 bg-amber-400/10 border-amber-400/20', icon: ArrowUpRight },
+  branch_addition: { label: 'Branch', color: 'text-blue-400 bg-blue-400/10 border-blue-400/20', icon: GitBranch },
+  auto_reinforced: { label: 'Reinforced', color: 'text-muted-foreground bg-card border-border', icon: Sparkles },
+} as const
+
+interface ProposalCardProps {
+  proposal: FlowProposalSummary
+  isSelected: boolean
+  onClick: () => void
+}
+
+export function ProposalCard({ proposal, isSelected, onClick }: ProposalCardProps) {
+  const typeConfig = TYPE_CONFIG[proposal.proposal_type] || TYPE_CONFIG.new_flow
+  const TypeIcon = typeConfig.icon
+
+  return (
+    <button
+      onClick={onClick}
+      className={`w-full text-left rounded-xl border p-3 space-y-2 transition-all ${
+        isSelected
+          ? 'border-primary/30 bg-primary/5'
+          : 'border-[rgba(255,255,255,0.06)] bg-[rgba(24,26,31,0.55)] hover:border-[rgba(255,255,255,0.12)]'
+      }`}
+    >
+      <div className="flex items-start justify-between gap-2">
+        <p className="text-sm font-semibold text-foreground line-clamp-2">{proposal.title}</p>
+        <span className={`shrink-0 flex items-center gap-1 rounded-md border px-1.5 py-0.5 font-label text-[0.5625rem] uppercase tracking-wider ${typeConfig.color}`}>
+          <TypeIcon size={10} />
+          {typeConfig.label}
+        </span>
+      </div>
+
+      {proposal.description && (
+        <p className="text-xs text-muted-foreground line-clamp-2">{proposal.description}</p>
+      )}
+
+      <div className="flex flex-wrap items-center gap-x-3 gap-y-1 text-xs text-muted-foreground">
+        {proposal.problem_domain && (
+          <span className="font-label rounded-md bg-primary/10 px-1.5 py-0.5 text-[0.5625rem] uppercase tracking-wider text-primary">
+            {proposal.problem_domain}
+          </span>
+        )}
+        <span className="flex items-center gap-1">
+          <Hash size={10} />
+          {proposal.supporting_session_count} session{proposal.supporting_session_count !== 1 ? 's' : ''}
+        </span>
+        <span className="flex items-center gap-1">
+          <Clock size={10} />
+          {new Date(proposal.created_at).toLocaleDateString()}
+        </span>
+        <span className="text-primary">
+          {Math.round(proposal.confidence_score * 100)}%
+        </span>
+      </div>
+    </button>
+  )
+}