ludic.shop, ludic.net: nothing made per tick - the week's lists and dice reused, the net's facts from a ring, the room's watch address made once, pools and kept lists through kept_push; what runs once per host, join, room or guest says so in @alloc_ok

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ludic.net/codes.ludic

@@ -3,6 +3,7 @@
 # six of the same letters.
 const NET_ALPHA: string = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789"
 
+@alloc_ok("once per join code shown")
 export function net_code_of(ip: int, port: int) -> string {
   let a = NET_ALPHA
   let buf = buffer(11)