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/api/flowProposals.ts

@@ -0,0 +1,41 @@
+import apiClient from './client'
+import type {
+  FlowProposalSummary,
+  FlowProposalDetail,
+  FlowProposalStats,
+  ReviewProposalRequest,
+} from '@/types/flow-proposal'
+
+export const flowProposalsApi = {
+  async list(params?: {
+    status?: string
+    type?: string
+    domain?: string
+    sort_by?: string
+    skip?: number
+    limit?: number
+  }): Promise<FlowProposalSummary[]> {
+    const response = await apiClient.get<FlowProposalSummary[]>('/flow-proposals', { params })
+    return response.data
+  },
+
+  async getStats(): Promise<FlowProposalStats> {
+    const response = await apiClient.get<FlowProposalStats>('/flow-proposals/stats')
+    return response.data
+  },
+
+  async get(id: string): Promise<FlowProposalDetail> {
+    const response = await apiClient.get<FlowProposalDetail>(`/flow-proposals/${id}`)
+    return response.data
+  },
+
+  async review(id: string, data: ReviewProposalRequest): Promise<FlowProposalDetail> {
+    const response = await apiClient.post<FlowProposalDetail>(
+      `/flow-proposals/${id}/review`,
+      data
+    )
+    return response.data
+  },
+}
+
+export default flowProposalsApi