feat: add 9 new games and update help/README
New commands: numguess/ng, wordchain/wc/endwc, acronym/ac, 20q/q/answer, nhie, hottake, ttt/move, blackjack/hit/stand, triviaduel/da. All per-room with AI-generated content where applicable. callbacks.py wired up for new reaction handlers (acronym votes, nhie, hottake). Help and README updated with full command reference. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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