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/game_plugin.rs

@@ -13,7 +13,7 @@ use chrono::Utc;
 use bevy::prelude::*;
 use bevy::tasks::{AsyncComputeTaskPool, Task, futures_lite::future};
 use bevy::window::AppLifecycle;
-use klondike::KlondikePile;
+use solitaire_core::KlondikePile;
 use solitaire_core::game_state::{DrawMode, GameMode, GameState};
 use solitaire_core::solver::{SolverConfig, SolverResult, try_solve};
 #[allow(deprecated)]
@@ -521,7 +521,7 @@ fn handle_new_game(
         // hides that information and reads naturally as "dealt from the
         // deck." Skipped when LayoutResource isn't present (headless tests).
         if let Some(layout) = layout.as_ref()
-            && let Some(stock) = layout.0.pile_positions.get(&klondike::KlondikePile::Stock)
+            && let Some(stock) = layout.0.pile_positions.get(&solitaire_core::KlondikePile::Stock)
         {
             for mut tx in &mut card_transforms {
                 tx.translation.x = stock.x;
@@ -1014,12 +1014,12 @@ fn pile_cards(game: &GameState, pile: &KlondikePile) -> Vec<solitaire_core::card
     }
 }
 
-fn foundation_slot(foundation: klondike::Foundation) -> Option<u8> {
+fn foundation_slot(foundation: solitaire_core::Foundation) -> Option<u8> {
     match foundation {
-        klondike::Foundation::Foundation1 => Some(0),
-        klondike::Foundation::Foundation2 => Some(1),
-        klondike::Foundation::Foundation3 => Some(2),
-        klondike::Foundation::Foundation4 => Some(3),
+        solitaire_core::Foundation::Foundation1 => Some(0),
+        solitaire_core::Foundation::Foundation2 => Some(1),
+        solitaire_core::Foundation::Foundation3 => Some(2),
+        solitaire_core::Foundation::Foundation4 => Some(3),
     }
 }
 
@@ -1294,7 +1294,7 @@ fn save_game_state_on_exit(
 #[cfg(test)]
 mod tests {
     use super::*;
-    use klondike::{Foundation, KlondikePile, Tableau};
+    use solitaire_core::{Foundation, KlondikePile, Tableau};
     use solitaire_core::klondike_adapter::{SavedKlondikePile, SavedTableau};
 
     /// Build a minimal headless `App` with just `GamePlugin` installed.
@@ -1423,8 +1423,10 @@ mod tests {
             "fresh game should inherit default take_from_foundation=true",
         );
 
-        let mut settings = solitaire_data::Settings::default();
-        settings.take_from_foundation = false;
+        let mut settings = solitaire_data::Settings {
+            take_from_foundation: false,
+            ..Default::default()
+        };
         app.world_mut()
             .write_message(crate::settings_plugin::SettingsChangedEvent(
                 settings.clone(),
@@ -1951,15 +1953,15 @@ mod tests {
         );
     }
 
-    /// Verify that the game-over overlay contains the expected header text and
-    /// action-hint strings so players understand why the overlay appeared and
-    /// what keys to press.
+    // Verify that the game-over overlay contains the expected header text and
+    // action-hint strings so players understand why the overlay appeared and
+    // what keys to press.
     // -----------------------------------------------------------------------
     // Task #56 — Escape dismisses GameOverScreen and starts new game
     // -----------------------------------------------------------------------
 
-    /// Pressing Escape while `GameOverScreen` is visible must fire
-    /// `NewGameRequestEvent` — identical behaviour to pressing N.
+    // Pressing Escape while `GameOverScreen` is visible must fire
+    // `NewGameRequestEvent` — identical behaviour to pressing N.
     // -----------------------------------------------------------------------
     // Task #48 — Undo with empty stack fires InfoToastEvent
     // -----------------------------------------------------------------------