every four to eleven seconds the bot draws a card from the deck we gave
it and puts it down on its own side, on the lane of whichever of its
towers stands furthest forward. the card goes through the same summon
factory the player's cards use, so it lands in the server simulation and
reaches the player inside the next snapshot rather than through any
special path.
placement comes from the bot's own tower positions rather than from the
tilemap, so the session does not need the map threaded into it.
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