refactor(core,engine,wasm): canonical FOUNDATIONS/TABLEAUS consts; adopt upstream SUITS/RANKS

Review findings 1+2 (Quat-underuse lens, 2026-07-06):

- solitaire_core gains pub const FOUNDATIONS / TABLEAUS — the canonical
  iteration source for the upstream pile enums (upstream klondike has no
  Foundation::ALL, and inherent impls cannot be added to foreign types).
  Deletes three identical private const-fn copies (radial_menu,
  table_plugin, input_plugin) and the hand-enumerated variants in
  card_plugin::sync::all_cards and solitaire_wasm.

- Hand-rolled [Suit; 4] / [Rank; 13] arrays replaced with upstream
  Suit::SUITS / Rank::RANKS. The order-sensitive CardImageSet indexing
  is re-keyed through canonical card_plugin::{suit_index, rank_index}
  helpers that match upstream order, with regression tests asserting
  the correspondence — one ordering everywhere instead of three
  divergent local ones.

Net -177 lines. No behaviour change; all consumers go through the
canonical helpers.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

solitaire_core/src/lib.rs

@@ -19,5 +19,33 @@ pub use klondike::{DrawStockConfig, Foundation, Klondike, KlondikeInstruction, K
 // former `solitaire_data::solver` wrapper module.
 pub use game_state::{DEFAULT_SOLVE_MOVES_BUDGET, DEFAULT_SOLVE_STATES_BUDGET, SolveOutcome};
 
+/// All four foundation slots, in slot order.
+///
+/// Canonical iteration source for `Foundation` — upstream `klondike` has no
+/// `Foundation::ALL` (unlike `Suit::SUITS` / `Rank::RANKS` in `card_game`),
+/// and inherent impls cannot be added to a foreign type, so the workspace
+/// const lives here. Use this instead of hand-rolling `[Foundation; 4]`
+/// arrays; scattered copies can silently diverge.
+pub const FOUNDATIONS: [Foundation; 4] = [
+    Foundation::Foundation1,
+    Foundation::Foundation2,
+    Foundation::Foundation3,
+    Foundation::Foundation4,
+];
+
+/// All seven tableau columns, in column order (left to right on screen).
+///
+/// Canonical iteration source for `Tableau` — see [`FOUNDATIONS`] for why
+/// this lives here rather than upstream.
+pub const TABLEAUS: [Tableau; 7] = [
+    Tableau::Tableau1,
+    Tableau::Tableau2,
+    Tableau::Tableau3,
+    Tableau::Tableau4,
+    Tableau::Tableau5,
+    Tableau::Tableau6,
+    Tableau::Tableau7,
+];
+
 #[cfg(test)]
 mod proptest_tests;