Save game_state.json on app exit and on pause open so players can
resume interrupted sessions. Delete the file on win, loss, or new-game
start. Restore the saved game on launch if it exists and isn't won.
- solitaire_core: add pile_map_serde module so HashMap<PileType,Pile>
round-trips through JSON (serialized as Vec of pairs)
- solitaire_data: add game_state_file_path, load_game_state_from,
save_game_state_to, delete_game_state_at with 8 new unit tests
- solitaire_engine/GamePlugin: restore saved game on startup, expose
GameStatePath resource, save on AppExit, delete on new-game and win
- solitaire_engine/PausePlugin: save on pause open (guards against
OS-level kills while the overlay is showing)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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