Implement Enhancements, Mainline modifiers and Maneuvers; fix unplayable track

src/engine/state.ts

@@ -73,7 +73,9 @@ export type CardGeometry =
   | { kind: 'limits' }
   | { kind: 'facility'; facility: FreightKind; axis?: TrackAxis }
   /** Not track — a Modifier sits beside a Facility and raises its capacity (§9). */
-  | { kind: 'modifier'; modifier: ModifierKind };
+  | { kind: 'modifier'; modifier: ModifierKind }
+  /** Not track — a Space-use card played at a district to consume a cell (Q6). */
+  | { kind: 'spaceUse'; key: string };
 
 export type TrackCard = {
   geometry: CardGeometry;
@@ -86,6 +88,8 @@ export type TrackCard = {
   standing: RollingStock[];
   facility: Facility | null;
   modifiers: ModifierKind[];
+  /** Enhancement cards laid on this card (§7 of implications.md). */
+  enhancements: string[];
 };
 
 export type OfficeArea = {
@@ -99,6 +103,18 @@ export type OfficeArea = {
   limitsEast: GridCoord;
   /** Trays holding at the Office. Length must never exceed the tier's A/D track count. */
   adOccupancy: TrayId[];
+  /**
+   * Trains held at the Limits by an Interlocking rather than admitted to the Office. They are
+   * inside the player's Limits but not occupying an A/D track.
+   */
+  heldAtLimits: TrayId[];
+  /** Dispatch bonuses spent this Day, by enhancement key — each is once a Day. */
+  dispatchUsedToday: string[];
+  /**
+   * The player's personal track supply (26 pieces), keyed `geometry:hand`. Track is NOT in the
+   * Home Office deck — it is laid from here.
+   */
+  trackSupply: Map<string, number>;
 };
 
 // ---------------------------------------------------------------------------
@@ -198,7 +214,16 @@ export type Transit = { tray: TrayId; stagesRemaining: number; direction: Direct
 
 export type DivisionNode =
   | { kind: 'divisionPoint'; side: Direction; holding: TrayId[] }
-  | { kind: 'mainline'; card: MainlineKind; transits: Transit[] }
+  | {
+      kind: 'mainline';
+      card: MainlineKind;
+      transits: Transit[];
+      absSignals?: boolean;
+      /** Brakeman / Airbrakes / Helpers / Realignment laid on this card. */
+      modifiers?: string[];
+      /** Red Flags protecting a stopped train here, by tray. */
+      redFlagged?: TrayId[];
+    }
   | { kind: 'office'; owner: PlayerIndex };
 
 /** Ordered west to east. For N players: N Office nodes and N+1 Mainline cards. */
@@ -328,6 +353,11 @@ export type TurnState = {
   option: 'switch' | 'draw' | 'freightAgent' | null;
   movesRemaining: number;
   drawnThisTurn: boolean;
+  /**
+   * Track was a CARD before it became a per-player supply, so it was naturally limited to one play
+   * a turn. The supply has 26 pieces and nothing else bounds it, so keep that limit explicitly.
+   */
+  laidThisTurn: boolean;
   freightAgentUsed: boolean;
   /** Set when the actor finishes; the phase driver then moves to the next player. */
   done: boolean;
@@ -338,6 +368,7 @@ export function freshTurn(moves: number): TurnState {
     option: null,
     movesRemaining: moves,
     drawnThisTurn: false,
+    laidThisTurn: false,
     freightAgentUsed: false,
     done: false,
   };