feat: Implement new peasant and standard pack generation algorithms, including special guest support and subset merging, and add relevant documentation.

docs/development/mtg-rulebook/peasant-pack-generation-algorithm.md

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+Slots 1-6 (Commons): 6 Common cards. Ensure color balance (attempt to include at least 3 distinct colors).
+Slot 7 (Common/List Slot):
+ - Roll a d100.
+ - 1-87: 1 Common from Main Set.
+ - 88-97: 1 Card from "The List" (Common/Uncommon reprint).
+ - 98-100: 1 Uncommon from "The List".
+Slots 8-11 (Uncommons): 4 Uncommon cards.
+Slot 12 (Land): 1 Basic or Common Dual Land (20% chance of Foil).
+Slot 13 (Non-Foil Wildcard):
+ - Can be any rarity (Common, Uncommon, Rare, Mythic).
+ - Use weighted probability: ~62% Common, ~37% Uncommon.
+ - Can be a card from the child sets.
+Slot 14 (Foil Wildcard):
+ - Same rarity weights as Slot 13, but the card must be Foil.
+Slot 15 (Marketing): Token or Art Card.