Patch Notes: Ready for more players

Servers

Reconnecting after a server update asks less of the account service. When the world chat was too busy to let you straight in, your game used to ask for a fresh sign-in token on every retry. Now it reuses the one it already has.
The account service can now answer sign-in token requests from Cloudflare's database read replicas.
The world chat server does less work for each player who joins or leaves, and that work grows far less with the number of players online.

The World tab's "Online" count now stays accurate once more than 512 players are in the world chat. It used to creep upward.
A World tab closed because you went online on another device no longer shows the old count over an empty list.

SCALE4d + SCALE5a + AUDIT: at 500 online - the token's reads on D1 replicas, the hub's hello and leave without a walk of every socket, a busy refusal that mints nothing, the World tab's count the room's own by @Lattymoy in #755

Full Changelog: app-v0.1.7567...app-v0.1.7572