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/Cargo.toml

@@ -10,7 +10,6 @@ image          = { workspace = true }
 solitaire_core = { workspace = true }
 solitaire_data = { workspace = true }
 solitaire_sync = { workspace = true }
-klondike       = { workspace = true }
 chrono         = { workspace = true }
 uuid           = { workspace = true }
 serde          = { workspace = true }