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/selection_plugin.rs

@@ -37,7 +37,7 @@
 
 use bevy::input::ButtonInput;
 use bevy::prelude::*;
-use klondike::{Foundation, KlondikePile, Tableau};
+use solitaire_core::{Foundation, KlondikePile, Tableau};
 use solitaire_core::card::Card;
 use solitaire_core::game_state::GameState;
 
@@ -1110,8 +1110,7 @@ mod tests {
         let selected = app
             .world()
             .resource::<SelectionState>()
-            .selected_pile
-            .clone();
+            .selected_pile;
         // The cycle order starts at Waste, but Waste is empty so the next
         // available pile (Tableau(0)) is selected.
         assert_eq!(selected, Some(KlondikePile::Tableau(Tableau::Tableau1)));
@@ -1277,15 +1276,13 @@ mod tests {
         let before = app
             .world()
             .resource::<SelectionState>()
-            .selected_pile
-            .clone();
+            .selected_pile;
         press_key(&mut app, KeyCode::Tab);
         app.update();
         let after = app
             .world()
             .resource::<SelectionState>()
-            .selected_pile
-            .clone();
+            .selected_pile;
 
         assert_eq!(
             before, after,