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/pending_hint.rs

@@ -26,7 +26,7 @@
 
 use bevy::prelude::*;
 use bevy::tasks::{AsyncComputeTaskPool, Task, futures_lite::future};
-use klondike::KlondikePile;
+use solitaire_core::KlondikePile;
 use solitaire_core::game_state::GameState;
 use solitaire_core::solver::{SolverConfig, SolverResult, try_solve_from_state};
 
@@ -186,7 +186,7 @@ mod tests {
     use super::*;
     use crate::events::HintVisualEvent;
     use crate::input_plugin::HintSolverConfig;
-    use klondike::{Foundation, Tableau};
+    use solitaire_core::{Foundation, Tableau};
     use solitaire_core::card::{Card, Rank, Suit};
     use solitaire_core::game_state::{DrawMode, GameState};