feat(11-01): extend PAX8 types with cost fields and sync-result shapes

- Pax8Subscription: price, partnerCost, currencyCode, productName, endDate, updatedDate
- Pax8Product: vendorName, shortDescription
- New Pax8EntitySyncResult / Pax8SyncResult mirroring AppgateSyncResult shape
- Note pre-existing unrelated tsc errors in sync-scheduler.ts (missing untracked
  appgate-factory/appgate-sync-service files in this worktree) in deferred-items.md

lib/types/pax8.ts

@@ -41,6 +41,12 @@ export interface Pax8Subscription {
   billingTerm: string | null;
   status: string | null;
   startDate: string | null;
+  price: number | null; // customer/list price (D-03)
+  partnerCost: number | null; // partner/reseller cost (D-03)
+  currencyCode: string | null;
+  productName: string | null;
+  endDate: string | null;
+  updatedDate: string | null;
   [key: string]: unknown; // escape hatch for fields not yet modeled
 }
 
@@ -50,6 +56,8 @@ export interface Pax8Product {
   vendorSku: string | null;
   name: string;
   category: string | null;
+  vendorName: string | null;
+  shortDescription: string | null;
   [key: string]: unknown; // escape hatch for fields not yet modeled
   // NOTE: the deprecated alternate-vendor-SKU field per PAX8's own schema is intentionally omitted.
 }
@@ -78,3 +86,27 @@ export interface Pax8OrderItem {
   currencyCode: string | null;
   [key: string]: unknown; // escape hatch for fields not yet modeled
 }
+
+// ─── Sync result shapes ───────────────────────────────────────────────────
+// Mirrors lib/types/appgate.ts's AppgateSyncResult/AppgateEntity shape —
+// the sync service (Plan 02) reports one Pax8EntitySyncResult per entity
+// type (companies/products/subscriptions), rolled up into a Pax8SyncResult.
+
+export interface Pax8EntitySyncResult {
+  entity: string;
+  success: boolean;
+  upserted: number;
+  tombstoned: number;
+  durationMs: number;
+  error?: string;
+}
+
+export interface Pax8SyncResult {
+  syncId: string;
+  status: 'completed' | 'failed';
+  startedAt: Date;
+  completedAt: Date | null;
+  durationMs: number;
+  entities: Pax8EntitySyncResult[];
+  errors: string[];
+}