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_wasm/Cargo.toml

@@ -12,7 +12,6 @@ solitaire_core = { path = "../solitaire_core" }
 serde          = { workspace = true }
 serde_json     = { workspace = true }
 chrono         = { workspace = true }
-klondike       = { workspace = true }
 wasm-bindgen   = "0.2"
 serde-wasm-bindgen = "0.6"
 console_error_panic_hook = { version = "0.1", optional = true }

solitaire_wasm/src/lib.rs

@@ -19,7 +19,7 @@
 //! is the contract.
 
 use chrono::NaiveDate;
-use klondike::{Foundation, KlondikePile, Tableau};
+use solitaire_core::{Foundation, KlondikePile, Tableau};
 use serde::{Deserialize, Serialize};
 use solitaire_core::card::Suit;
 use solitaire_core::error::MoveError;