Reflected Swap Meet: the reflector chooses the trade (rev 27)

'FULL REFLECTION lets the other player decide which objects, if any,
will be swapped' — the reflector's choice now rides their counteract
(params.cardId, reflector's item first), resolved with the roles
swapped when the reflection settles; 'none' or no choice trades
nothing. The client walks the reflector through the same give-and-take
picker, with a 'swap nothing' refusal.

Also from room XRT7: the trade picker now honors each room's own rules
revision (older rooms trade only object-typed cards), so it can no
longer offer a wizardblade a rev-25 engine will quietly refuse — and a
fizzled swap finally says so in the log instead of vanishing.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0138A8CjeQRpvzKxuMfz1Bqc

packages/server/src/rooms.ts

@@ -54,7 +54,7 @@ export interface Room {
 const rooms = new Map<string, Room>();
 
 /** Rules revision new games are dealt under (stored games keep their own). */
-const RULES_REV = 26;
+const RULES_REV = 27;
 
 const ROOM_CODE_ALPHABET = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789";