Track becomes a deck card, Departments become decks, and trains must be made up to leave, industry restrictions enforced, update display and add a new game button

src/engine/legal.ts

@@ -90,6 +90,9 @@ function localOpsCandidates(s: GameState, player: PlayerIndex): Intent[] {
     }
     for (let n = 1; n <= tray.consist.length; n++) {
       out.push({ type: 'switch.dropCars', trayId, count: n });
+      // Off the nose as well as the tail — the only way to get cars back off the front of a train
+      // that shoved a cut, and therefore the only way an engine buried mid-train reaches an end.
+      out.push({ type: 'switch.dropCars', trayId, count: n, fromNose: true });
     }
     // Small Yard: enumerating every permutation would explode, so offer the useful ones —
     // bringing each car to the droppable end, plus a full reversal. `check` validates any order,
@@ -136,31 +139,19 @@ function localOpsCandidates(s: GameState, player: PlayerIndex): Intent[] {
   });
   for (const cardId of s.decks.hands.get(player) ?? []) {
     out.push({ type: 'card.play', cardId });
-    // Gap 11 — orientation is chosen on placement, so every rotation is a distinct candidate.
-    // Six is the widest set (turnouts); `check` discards the ones whose ports do not meet.
-    const targets = s.cards.get(cardId)?.kind.kind === 'enhancement' ? attachments : placements;
+    const kind = s.cards.get(cardId)?.kind;
+    // Enhancements ATTACH to a card already down, so their candidates are the occupied cells.
+    const targets = kind?.kind === 'enhancement' ? attachments : placements;
+    // Orientation is chosen on placement, and a printed card turns but never flips, so the widest
+    // variant set is TWO. Anything that is not track has a single orientation and needs one entry.
+    const rotations = kind?.kind === 'track' ? variantsFor(kind.geometry, kind.hand).length : 1;
     for (const placement of targets) {
-      // A printed card turns but does not flip, so the widest variant set is TWO. This offered six
-      // per placement per card back when a curve could be laid at all four rotations; four of every
-      // six were dead weight in an option list the bot scores in full.
-      for (let variant = 0; variant < 2; variant++) {
+      for (let variant = 0; variant < rotations; variant++) {
         out.push({ type: 'card.play', cardId, placement, variant });
       }
     }
     for (let slot = 0; slot < 3; slot++) out.push({ type: 'card.discard', cardId, toSlot: slot });
   }
-  // Lay track from the personal supply — the only way a district grows now that track is not in
-  // the deck.
-  for (const [key, count] of s.turn.laidThisTurn ? [] : area.trackSupply) {
-    if (count < 1) continue;
-    const [geometry, hand] = key.split(':') as [TrackGeometry, Hand];
-    for (const placement of placements) {
-      // 0° and 180°. A straight is the same card either way; `check` discards the duplicate.
-      for (let variant = 0; variant < variantsFor(geometry, hand).length; variant++) {
-        out.push({ type: 'track.lay', geometry, hand, placement, variant });
-      }
-    }
-  }
   // Mainline modifiers go on a Mainline card, not a grid cell, so `node` indexes division.nodes.
   for (const cardId of s.decks.hands.get(player) ?? []) {
     if (s.cards.get(cardId)?.kind.kind !== 'mainlineModifier') continue;