refactor(engine,wasm,data): route all klondike/card_game imports through solitaire_core

All downstream crates now import Foundation, KlondikePile, Tableau,
Klondike, Session, Suit, Rank exclusively from solitaire_core.
solitaire_core is the single version-pin point for the upstream crates.

- solitaire_engine: 19 files updated, klondike direct dep removed
- solitaire_wasm: use statement updated, klondike direct dep removed
- solitaire_data: unused klondike dep removed
- Cargo.lock: klondike no longer a direct dep of engine/wasm/data
- Full workspace clippy clean, all tests pass

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

solitaire_engine/src/cursor_plugin.rs

@@ -34,7 +34,7 @@
 
 use bevy::prelude::*;
 use bevy::window::{CursorIcon, PrimaryWindow, SystemCursorIcon};
-use klondike::{Foundation, KlondikePile, Tableau};
+use solitaire_core::{Foundation, KlondikePile, Tableau};
 use solitaire_core::game_state::{DrawMode, GameState};
 
 use crate::card_plugin::RightClickHighlight;
@@ -655,7 +655,7 @@ mod tests {
             .world_mut()
             .query::<&DropTargetOverlay>()
             .iter(app.world())
-            .map(|o| o.0.clone())
+            .map(|o| o.0)
             .collect();
         assert!(
             !overlays.contains(&KlondikePile::Tableau(Tableau::Tableau3)),