Changelog
- Add typed packets 2090-2096, 2171 and 2172 for the poker room, deal, turn, action, showdown and result flow
- Add PokerTable as an NPC entity spawned with MsgTexasNpcInfo, and PokerManager for seats, ticks and leave hooks
- Add PokerHand evaluator ranked to the client result strings, with side pots for all-in hands
- Escrow seated silver in poker_chips, persist stacks after each hand and refund orphaned rows on start
- Add migration 053 with both poker halls, 18 silver tables and House Dealer hall NPCs
- Document the client protocol in AI_Docs/research/Poker.6609.md