Implements PileType/Pile, MoveError (thiserror), Deck with seeded shuffle, deal_klondike layout, foundation/tableau placement rules, and Windows XP Standard scoring — 41 tests, clippy clean. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>