Fix parking trains, freight deadlock, and Whistle Post lock-in

src/engine/state.ts

@@ -198,6 +198,15 @@ export type CrewTray = {
   /** ORDERED, left-to-right. Max 4 including any caboose (§A.4). */
   consist: RollingStock[];
   direction: Direction;
+  /**
+   * Which way the engine points, as an actual port on the card beneath it.
+   *
+   * NOT derivable from `direction`, which only has east and west: a crew standing on a north-south
+   * spur points north or south, and deriving 'e'/'w' gave it an exit port the card does not have —
+   * so it had no legal moves at all and was stranded permanently. Left optional so a tray placed
+   * without one falls back to `direction`.
+   */
+  facing?: 'n' | 's' | 'e' | 'w';
   position: NodeRef;
   movesUsed: number;
 };
@@ -221,6 +230,11 @@ export type DivisionNode =
       absSignals?: boolean;
       /** Brakeman / Airbrakes / Helpers / Realignment laid on this card. */
       modifiers?: string[];
+      /**
+       * Which way a train is travelling when it climbs. The Heavy Grade card prints "(Up)" and
+       * "Player sets orientation", so the direction is chosen when the card is placed.
+       */
+      gradeUp?: Direction;
       /** Red Flags protecting a stopped train here, by tray. */
       redFlagged?: TrayId[];
     }