feat(core): integrate klondike v0.3.0 / card_game v0.4.0 — solver + serde newtypes

Step 6: replace 767-line DFS seed-solver with Session<Klondike>::solve().
- try_solve_with_first_move() now delegates to card_game::Session::solve()
  with solve_moves_budget/solve_states_budget from SolverConfig
- Maps Ok(Some) → Winnable, Ok(None) → Unwinnable, Err → Inconclusive
- try_solve_from_state() retains the DFS (pile mapping pending, step 2)
- Removed dead SolverState::initial() — no longer needed for seed path
- Updated tests: session solver returns no Unwinnable in 0..500 range
  (all non-Winnable deals are Inconclusive); updated engine seed-retry test

Step 7: SavedInstruction serde newtypes in klondike_adapter.
- SavedInstruction mirrors KlondikeInstruction with Serialize+Deserialize
- Sub-types: SavedDstFoundation, SavedDstTableau, SavedKlondikePile,
  SavedKlondikePileStack, SavedTableauStack, SavedTableau, SavedFoundation,
  SavedSkipCards — all with serde derives
- From<KlondikeInstruction> for SavedInstruction (infallible)
- TryFrom<SavedInstruction> for KlondikeInstruction (InvalidSavedInstruction
  on out-of-range u8 values)
- InvalidSavedInstruction error type via thiserror

Also: chore(deps): bump klondike to v0.3.0, card_game to v0.4.0 (Cargo.toml/lock)

All 1399 tests pass; clippy clean.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Cargo.lock

@@ -1887,9 +1887,9 @@ dependencies = [
 
 [[package]]
 name = "card_game"
-version = "0.3.0"
+version = "0.4.0"
 source = "sparse+https://git.aleshym.co/api/packages/Quaternions/cargo/"
-checksum = "38b68e4fb32f8a1f92edf8488c012f6d8af71491a2f9f8a855362d7eaf1a2d0c"
+checksum = "d206df6d87340019a0f5b621976cf98bc75c659a7f93ef348aaab2a9336098a9"
 dependencies = [
  "arrayvec 0.7.6 (sparse+https://git.aleshym.co/api/packages/Quaternions/cargo/)",
 ]
@@ -4354,9 +4354,9 @@ dependencies = [
 
 [[package]]
 name = "klondike"
-version = "0.2.0"
+version = "0.3.0"
 source = "sparse+https://git.aleshym.co/api/packages/Quaternions/cargo/"
-checksum = "0bce541f9b14e9d9d8c9b17d5df40bd0a017709b61d9be8ad5bab7b19a1a0152"
+checksum = "347d55e6cf7c90b3d038262071eb2fdb0b75a713fe66c452a3400ff08fb716bc"
 dependencies = [
  "card_game",
  "rand 0.10.1",