v0.3.0 — entitlements catalog in PublicPoliciesResponse

Mirrors the Keysat migration 0014 server-side change. The product
object on listPublicPolicies() now includes entitlementsCatalog —
the closed list of {slug, name, description} the operator declared
on the product. SDK consumers' in-app tier pickers can render the
human-readable name ("AI summaries") with the description as a
tooltip instead of the raw slug ("ai_summaries").

New exports:
- EntitlementDef type
- PublicPoliciesResponse.product.entitlementsCatalog: EntitlementDef[]

Empty array on legacy products that don't have a catalog yet —
SDK consumers fall back to rendering the raw policy.entitlements
slugs directly. No breaking change to existing consumers.

Bumps to 0.3.0 minor since the surface is purely additive.
15/15 crosscheck tests still pass.

src/index.ts

@@ -16,6 +16,7 @@ export {
   type StartPurchaseOptions,
   type PublicPolicy,
   type PublicPoliciesResponse,
+  type EntitlementDef,
   type RedeemFreeOptions,
   type RedeemFreeResponse,
 } from './online.js'

src/online.ts

@@ -143,12 +143,35 @@ export interface PublicPolicy {
   trialDays: number
 }
 
+/**
+ * One entry in a product's entitlements catalog. Defined by the
+ * operator in admin (Keysat migration 0014). Use
+ * {@link EntitlementDef.name} as the human-readable label when
+ * rendering an in-app tier picker — e.g. "AI summaries" instead
+ * of the raw `ai_summaries` slug. {@link EntitlementDef.description}
+ * is a one-sentence tooltip; may be empty.
+ */
+export interface EntitlementDef {
+  slug: string
+  name: string
+  description: string
+}
+
 export interface PublicPoliciesResponse {
   product: {
     slug: string
     name: string
     description: string
     basePriceSats: number
+    /**
+     * Closed list of entitlements this product offers, with display
+     * names + descriptions for buyer-facing rendering. Empty array
+     * when the operator hasn't defined a catalog (legacy "free-text"
+     * mode — render the raw slugs from {@link PublicPolicy.entitlements}
+     * directly, or replace underscores with spaces for a quick
+     * fallback).
+     */
+    entitlementsCatalog: EntitlementDef[]
   }
   policies: PublicPolicy[]
 }
@@ -296,6 +319,13 @@ export class Client {
         name: product.name as string,
         description: (product.description as string) ?? '',
         basePriceSats: product.base_price_sats as number,
+        entitlementsCatalog: (
+          (product.entitlements_catalog as Array<Record<string, unknown>>) ?? []
+        ).map((c) => ({
+          slug: c.slug as string,
+          name: (c.name as string) ?? (c.slug as string),
+          description: (c.description as string) ?? '',
+        })),
       },
       policies: policies.map((p) => ({
         slug: p.slug as string,