chore: remove shadow policy machinery (ADR-0013 step 10)

Deletes shadowPolicies map, getShadowPolicies, setPolicyActive from
recommender.ts; removes /api/admin/policies routes from admin.ts; removes
getPolicies, togglePolicy, PolicyInfo from admin api.ts; removes the
policy toggle section from the ops page.

168 API tests pass.

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

apps/admin/src/lib/api.ts

@@ -91,10 +91,6 @@ export interface HealthStatus {
   services: { name: string; status: string; latencyMs: number }[];
 }
 
-export interface PolicyInfo {
-  name: string;
-  active: boolean;
-}
 
 export interface SavedQuery {
   id: string;
@@ -223,16 +219,6 @@ export function getHealth() {
   return apiFetch<HealthStatus>('/admin/health');
 }
 
-export function getPolicies() {
-  return apiFetch<{ policies: PolicyInfo[] }>('/admin/policies');
-}
-
-export function togglePolicy(name: string, active: boolean) {
-  return apiFetch<{ ok: boolean }>(`/admin/policies/${name}/toggle`, {
-    method: 'POST',
-    body: JSON.stringify({ active }),
-  });
-}
 
 export function replaySignal(subject: string, payload: Record<string, unknown>) {
   return apiFetch<{ ok: boolean }>('/admin/replay-signal', {