feat: Member Effectiveness Score + Representation Alignment View (v0.9.9)

Member Effectiveness Score
- New BillCosponsor table (migration 0018) with per-bill co-sponsor
  party data required for the bipartisan multiplier
- bill_category column on Bill (substantive | commemorative | administrative)
  set by a cheap one-shot LLM call after each brief is generated
- effectiveness_score / percentile / tier columns on Member
- New bill_classifier.py worker with 5 tasks:
    classify_bill_category  — triggered from llm_processor after brief
    fetch_bill_cosponsors   — triggered from congress_poller on new bill
    calculate_effectiveness_scores — nightly at 5 AM UTC
    backfill_bill_categories / backfill_all_bill_cosponsors — one-time
- Scoring: distance-traveled pts × bipartisan (1.5×) × substance (0.1×
  for commemorative) × leadership (1.2× for committee chairs)
- Percentile normalised within (seniority tier × party) buckets
- Effectiveness card on member detail page with colour-coded bar
- Admin panel: 3 new backfill/calculate controls in Maintenance section

Representation Alignment View
- New GET /api/alignment endpoint: cross-references user's stanced bill
  follows (pocket_veto/pocket_boost) with followed members' vote positions
- Efficient bulk queries — no N+1 loops
- New /alignment page with ranked member list and alignment bars
- Alignment added to sidebar nav (auth-required)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/app/settings/page.tsx

@@ -22,7 +22,7 @@ import {
   Wrench,
 } from "lucide-react";
 import Link from "next/link";
-import { settingsAPI, adminAPI, notificationsAPI, type AdminUser, type LLMModel, type ApiHealthResult } from "@/lib/api";
+import { settingsAPI, adminAPI, notificationsAPI, type AdminUser, type LLMModel, type ApiHealthResult, alignmentAPI } from "@/lib/api";
 import { useAuthStore } from "@/stores/authStore";
 
 function relativeTime(isoStr: string): string {
@@ -862,6 +862,27 @@ export default function SettingsPage() {
           }
 
           const maintenance: ControlItem[] = [
+            {
+              key: "cosponsors",
+              name: "Backfill Co-sponsors",
+              description: "Fetch co-sponsor lists from Congress.gov for all bills. Required for bipartisan multiplier in effectiveness scoring.",
+              fn: adminAPI.backfillCosponsors,
+              status: "on-demand",
+            },
+            {
+              key: "categories",
+              name: "Classify Bill Categories",
+              description: "Run a lightweight LLM call on each bill to classify it as substantive, commemorative, or administrative. Used to weight effectiveness scores.",
+              fn: adminAPI.backfillCategories,
+              status: "on-demand",
+            },
+            {
+              key: "effectiveness",
+              name: "Calculate Effectiveness Scores",
+              description: "Score all members by legislative output, bipartisanship, bill substance, and committee leadership. Runs automatically nightly at 5 AM UTC.",
+              fn: adminAPI.calculateEffectiveness,
+              status: "on-demand",
+            },
             {
               key: "backfill-actions",
               name: "Backfill All Action Histories",