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/input_plugin.rs

@@ -26,7 +26,7 @@ use bevy::prelude::*;
 use bevy::window::PrimaryWindow;
 #[cfg(not(target_os = "android"))]
 use bevy::window::{MonitorSelection, WindowMode};
-use klondike::{Foundation, KlondikePile, Tableau};
+use solitaire_core::{Foundation, KlondikePile, Tableau};
 use solitaire_core::card::{Card, Suit};
 use solitaire_core::game_state::GameState;
 
@@ -1788,7 +1788,7 @@ const _VEC3_REFERENCED: Option<Vec3> = None;
 mod tests {
     use super::*;
     use crate::layout::compute_layout;
-    use klondike::{Foundation, Tableau};
+    use solitaire_core::{Foundation, Tableau};
     use solitaire_core::game_state::{DrawMode, GameState};
 
     fn clear_test_piles(game: &mut GameState) {
@@ -2276,8 +2276,8 @@ mod tests {
         assert_eq!(*count, 1);
     }
 
-    /// `all_hints` must be empty when both stock and waste are empty and no
-    /// pile-to-pile move exists — the game is truly stuck.
+    // `all_hints` must be empty when both stock and waste are empty and no
+    // pile-to-pile move exists — the game is truly stuck.
     // -----------------------------------------------------------------------
     // Drag-rejection return tween — `CardAnimation` replaces the legacy
     // `ShakeAnim` on the dragged cards. The audio cue