refactor: slim solver to card_game-native types

Per Rhys: card_game's solver is the real engine, so drop the redundant
adapter types in solitaire_data::solver rather than maintain a parallel
verdict/config/move vocabulary.

- Delete SolverResult, SolverConfig, SolverMove, and snapshot_to_solver_move.
  The verdict now reads straight off card_game's return:
    Ok(Some(instr)) = winnable (first move on the path)
    Ok(None)        = provably unwinnable
    Err(_)          = inconclusive (budget exceeded)
- SolveOutcome is now Result<Option<KlondikeInstruction>, SolveError>.
- try_solve / try_solve_from_state take plain (moves_budget, states_budget)
  u64s; add DEFAULT_SOLVE_{MOVES,STATES}_BUDGET consts.
- snapshot_to_solver_move duplicated core's GameState::instruction_to_move,
  so make that pub and have the hint convert the first-move instruction to
  highlighted (from, to) piles through it. Re-export KlondikeInstruction
  from solitaire_core.
- HintSolverConfig now holds { moves_budget, states_budget } instead of
  wrapping the deleted SolverConfig.
- Update consumers: pending_hint, play_by_seed (verdict badge), game_plugin
  (choose_winnable_seed), input_plugin, hud_plugin, and the gen_seeds /
  gen_difficulty_seeds asset tools.

solver.rs drops 274 -> 140 lines. cargo test --workspace and
cargo clippy --workspace --all-targets -- -D warnings pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

solitaire_core/src/game_state.rs

@@ -826,7 +826,14 @@ impl GameState {
         }
     }
 
-    fn instruction_to_move(
+    /// Converts an upstream [`KlondikeInstruction`] into the engine's
+    /// `(from, to, count)` pile-move form, resolving multi-card tableau moves
+    /// against the live board. Returns `None` for no-op instructions
+    /// (foundation→foundation, or a tableau move of zero cards).
+    ///
+    /// Used by the hint system to render a solver's recommended first move,
+    /// and internally by [`Self::possible_instructions`].
+    pub fn instruction_to_move(
         &self,
         instruction: KlondikeInstruction,
     ) -> Option<(KlondikePile, KlondikePile, usize)> {

solitaire_core/src/lib.rs

@@ -12,7 +12,7 @@ pub mod klondike_adapter;
 // re-exported — they are only used internally in `klondike_adapter.rs` and do
 // not appear in any public method signature.
 pub use card_game::{Card, Session};
-pub use klondike::{Foundation, Klondike, KlondikePile, Tableau};
+pub use klondike::{Foundation, Klondike, KlondikeInstruction, KlondikePile, Tableau};
 pub use klondike_adapter::DrawMode;
 
 #[cfg(test)]