fix(core): validate moved tableau stack forms a legal run

move_cards only checked that the *bottom* card of a moved stack landed
legally on the destination — the cards above the bottom went through
unverified. A player could lift an arbitrary selection from one column
and drop it on another whenever the bottom happened to match, even if
the upper cards didn't form a descending alternating-colour sequence.

Adds is_valid_tableau_sequence(&[Card]) -> bool to rules.rs (4 lines)
and one call site in move_cards's tableau-destination branch. One
focused test covering single-card / valid-run / same-colour /
rank-gap cases.

Reported by Quat: "stack 4 onto stack 2" was accepted when illegal.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

solitaire_core/src/game_state.rs

@@ -4,7 +4,7 @@ use crate::card::Card;
 use crate::deck::{deal_klondike, Deck};
 use crate::error::MoveError;
 use crate::pile::{Pile, PileType};
-use crate::rules::{can_place_on_foundation, can_place_on_tableau};
+use crate::rules::{can_place_on_foundation, can_place_on_tableau, is_valid_tableau_sequence};
 use crate::scoring::{compute_time_bonus as scoring_time_bonus, score_move, score_undo as scoring_undo};
 
 const MAX_UNDO_STACK: usize = 64;
@@ -283,6 +283,18 @@ impl GameState {
                     if !can_place_on_tableau(&bottom_card, dest) {
                         return Err(MoveError::RuleViolation("invalid tableau placement".into()));
                     }
+                    // The previous check only validates that the *bottom* of the
+                    // moved stack lands on the destination's top card. Without
+                    // this guard, a player could lift an arbitrary multi-card
+                    // selection from one column and drop it onto another whenever
+                    // the bottom card happens to match — even if the cards
+                    // above the bottom don't form a legal descending
+                    // alternating-colour run.
+                    if !is_valid_tableau_sequence(&from_pile.cards[start..]) {
+                        return Err(MoveError::RuleViolation(
+                            "moved cards must form a valid tableau run".into(),
+                        ));
+                    }
                 }
                 _ => return Err(MoveError::InvalidDestination),
             }

solitaire_core/src/rules.rs

@@ -30,6 +30,18 @@ pub fn can_place_on_tableau(card: &Card, pile: &Pile) -> bool {
     }
 }
 
+/// Returns `true` if `cards` is a legal tableau run on its own — every
+/// adjacent pair descends by one rank and alternates colour. A single
+/// card is trivially valid. The destination check is separate; this
+/// only validates the sequence's *internal* structure, which the tableau
+/// move path must enforce so a player can't smuggle an arbitrary stack
+/// onto another column when the bottom card happens to land legally.
+pub fn is_valid_tableau_sequence(cards: &[Card]) -> bool {
+    cards.windows(2).all(|w| {
+        w[0].rank.value() == w[1].rank.value() + 1 && w[0].suit.is_red() != w[1].suit.is_red()
+    })
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -174,4 +186,26 @@ mod tests {
         let p = pile_with(PileType::Tableau(0), vec![top]);
         assert!(!can_place_on_tableau(&c, &p));
     }
+
+    #[test]
+    fn tableau_sequence_validation() {
+        // Single card is trivially a valid sequence.
+        assert!(is_valid_tableau_sequence(&[card(Suit::Hearts, Rank::Five)]));
+        // Valid descending alternating-colour run K♠ Q♥ J♣.
+        assert!(is_valid_tableau_sequence(&[
+            card(Suit::Spades, Rank::King),
+            card(Suit::Hearts, Rank::Queen),
+            card(Suit::Clubs, Rank::Jack),
+        ]));
+        // Same colour twice (Q♠ on K♠) — invalid.
+        assert!(!is_valid_tableau_sequence(&[
+            card(Suit::Spades, Rank::King),
+            card(Suit::Spades, Rank::Queen),
+        ]));
+        // Rank gap (K♠ → J♥) — invalid.
+        assert!(!is_valid_tableau_sequence(&[
+            card(Suit::Spades, Rank::King),
+            card(Suit::Hearts, Rank::Jack),
+        ]));
+    }
 }