feat: unify recommend anonymous runtime guest auth

- Route recommended runtime launches through shared runtime guest token handling
- Extend recommend-page anonymous play beyond jump-hop
- Add regression coverage for runtime guest launch clients
- Update docs to reflect the full anonymous-play matrix

packages/shared/src/contracts/auth.ts

@@ -25,6 +25,13 @@ export type PublicUserSearchResponse = {
   user: PublicUserSummary;
 };
 
+export type RuntimeGuestTokenResponse = {
+  token: string;
+  expiresAt: string;
+  subject: string;
+  scope: string;
+};
+
 export type AuthEntryRequest = {
   phone: string;
   password: string;