Add `SolitaireGame` WASM binding to `solitaire_wasm` exposing draw(),
move_cards(), undo(), auto_complete_step(), and state() — all backed by
the real solitaire_core rules engine.
Add /play route to solitaire_server serving a full vanilla-JS
interactive Klondike game (game.html / game.css / game.js). Features:
drag-and-drop card moves (mouse + touch via PointerEvents), click stock
to draw, double-click card to auto-move to foundation, undo, draw-1/3
toggle, new game, auto-complete animation, win overlay, seed display.
Rebuild solitaire_wasm.js + solitaire_wasm_bg.wasm.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>