the Roster Pass: every train at the Office visible

Builds "The Roster Pass" / "Two Trains, One Card" (station display for
multiple trains at one Office). The Office is the one square where
more than one train may legally stand at once (one per A/D track), and
CellView.train had room for exactly one — a second train at a busy
Station was counted in the old A/D pips and never drawn.

CellView.train -> CellView.trains: TrainView[], seat-filtered and
collecting every match rather than the first (fixes a latent
cross-district leak in the process: trainOnCard never checked seat).
The A/D pips are replaced with one roster chip per A/D track, always,
free or occupied; clicking a chip sets selectedCrew, wiring the board
and the action panel to the same value.

standingWest moves from CrewTray to TrackCard: two trays sharing one
Office card need one shared split, not one each, and there is no such
thing as "west of one particular A/D track". No save migration — Save
replays through the engine — and a stale value on an emptied card is
inert because nothing reads a split with no train standing there.

The Division map's Office cell is now sized by A/D capacity rather
than occupancy, so it holds still as trains arrive and leave; chips
lay into fixed slots instead of centre-spreading onto the Limits cards
either side.

584 tests, 0 failures. Verified end-to-end against the built app and a
direct render of a 4-train Terminal (screenshotted).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SAt2YCXgd5qCjBcF2x34aK

test/track.test.ts

@@ -48,6 +48,7 @@ const straight = (standing: RollingStock[] = []): TrackCard => ({
   geometry: { kind: 'track', geometry: 'straight' },
   baseOperationalRail: true,
   standing,
+  standingWest: 0,
   facility: null,
   modifiers: [],
   enhancements: [],
@@ -62,6 +63,7 @@ const curve = (arc: TrackArc, standing: RollingStock[] = []): TrackCard => ({
   geometry: { kind: 'track', geometry: 'curved', arc },
   baseOperationalRail: true,
   standing,
+  standingWest: 0,
   facility: null,
   modifiers: [],
   enhancements: [],
@@ -73,6 +75,7 @@ const turnout = (o?: TurnoutOrientation): TrackCard => ({
     : { kind: 'track', geometry: 'turnout' },
   baseOperationalRail: false, // no wheel icon — a train may pass through but not stop (§A.1)
   standing: [],
+  standingWest: 0,
   facility: null,
   modifiers: [],
   enhancements: [],
@@ -82,6 +85,7 @@ const officeCard = (): TrackCard => ({
   geometry: { kind: 'office' },
   baseOperationalRail: true,
   standing: [],
+  standingWest: 0,
   facility: null,
   modifiers: [],
   enhancements: [],
@@ -91,6 +95,7 @@ const lockedFacility = (): TrackCard => ({
   geometry: { kind: 'facility', facility: 'mineTipple' },
   baseOperationalRail: true,
   standing: [],
+  standingWest: 0,
   // A load sitting on MEN|AT|WORK locks the industry track down (§9.3).
   facility: {
     kind: 'freight',
@@ -114,7 +119,7 @@ const car = (): RollingStock => ({ type: 'boxcar', loaded: false });
 function straightCard(): TrackCard {
   return {
     geometry: { kind: 'track', geometry: 'straight' },
-    baseOperationalRail: true, standing: [], facility: null, modifiers: [], enhancements: [],
+    baseOperationalRail: true, standing: [], standingWest: 0, facility: null, modifiers: [], enhancements: [],
   };
 }
 
@@ -210,6 +215,7 @@ describe('ports and geometry', () => {
       geometry: { kind: 'track', geometry: 'curved', hand: 'left' },
       baseOperationalRail: true,
       standing: [],
+      standingWest: 0,
       facility: null,
       modifiers: [],
       enhancements: [],
@@ -629,7 +635,7 @@ describe('placement and drop-off', () => {
 describe('curves are arcs, and arcs make sidings possible', () => {
   const arcCard = (arc: 'ne' | 'nw' | 'se' | 'sw', geometry: 'curved' | 'sharpCurved' = 'curved'): TrackCard => ({
     geometry: { kind: 'track', geometry, arc },
-    baseOperationalRail: true, standing: [], facility: null, modifiers: [], enhancements: [],
+    baseOperationalRail: true, standing: [], standingWest: 0, facility: null, modifiers: [], enhancements: [],
   });
 
   it('joins exactly two adjacent edges, with no through track', () => {
@@ -647,7 +653,7 @@ describe('curves are arcs, and arcs make sidings possible', () => {
       c.map((p) => [...p].sort().join('')).sort().join(' ');
     const turnout: TrackCard = {
       geometry: { kind: 'track', geometry: 'turnout', turnout: { stem: 'w', through: 'e', diverge: 's' } },
-      baseOperationalRail: true, standing: [], facility: null, modifiers: [], enhancements: [],
+      baseOperationalRail: true, standing: [], standingWest: 0, facility: null, modifiers: [], enhancements: [],
     };
     for (const arc of ['ne', 'nw', 'se', 'sw'] as const) {
       assert.notEqual(norm(connectionsFor(arcCard(arc))), norm(connectionsFor(turnout)),
@@ -690,11 +696,11 @@ describe('curves are arcs, and arcs make sidings possible', () => {
     const ew = (): TrackCard => straightCard();
     const grid: Record<string, TrackCard> = {
       '0,-2': ew(),
-      '0,-1': { geometry: { kind: 'track', geometry: 'turnout', turnout: { stem: 'w', through: 'e', diverge: 's' }, hand: 'right' }, baseOperationalRail: true, standing: [], facility: null, modifiers: [], enhancements: [] },
+      '0,-1': { geometry: { kind: 'track', geometry: 'turnout', turnout: { stem: 'w', through: 'e', diverge: 's' }, hand: 'right' }, baseOperationalRail: true, standing: [], standingWest: 0, facility: null, modifiers: [], enhancements: [] },
       '-1,-1': arcCard('ne'),
       '-1,0': ew(),
       '-1,1': arcCard('nw'),
-      '0,1': { geometry: { kind: 'track', geometry: 'turnout', turnout: { stem: 'e', through: 'w', diverge: 's' }, hand: 'left' }, baseOperationalRail: true, standing: [], facility: null, modifiers: [], enhancements: [] },
+      '0,1': { geometry: { kind: 'track', geometry: 'turnout', turnout: { stem: 'e', through: 'w', diverge: 's' }, hand: 'left' }, baseOperationalRail: true, standing: [], standingWest: 0, facility: null, modifiers: [], enhancements: [] },
       '0,0': ew(),
     };
     const area = areaFrom(grid, { row: 0, col: 0 });
@@ -778,6 +784,7 @@ describe('Operational Rail — where a train may stop and leave cars (Appendix A
     geometry: { kind: 'facility', facility: 'mineTipple' },
     baseOperationalRail: true,
     standing: [],
+    standingWest: 0,
     facility: {
       kind: 'freight', subtype: 'mineTipple',
       allows: { outbound: true, inbound: false },
@@ -919,7 +926,7 @@ describe('a turnout may be laid to face another, making a crossover', () => {
   /** A turnout stated the way the cards read: who may come in, and where they may go. */
   const facing = (stem: Port, through: Port, diverge: Port, hand: 'left' | 'right'): TrackCard => ({
     geometry: { kind: 'track', geometry: 'turnout', turnout: { stem, through, diverge }, hand },
-    baseOperationalRail: false, standing: [], facility: null, modifiers: [], enhancements: [],
+    baseOperationalRail: false, standing: [], standingWest: 0, facility: null, modifiers: [], enhancements: [],
   });
 
   it('joins a south-diverging turnout to the north-diverging one beneath it', () => {
@@ -1027,6 +1034,7 @@ describe('why a square is NOT offered (the same walk, keeping its rejections)',
     geometry: { kind: 'facility', facility: 'mineTipple' },
     baseOperationalRail: true,
     standing: [],
+    standingWest: 0,
     facility: {
       kind: 'freight', subtype: 'mineTipple',
       allows: { outbound: true, inbound: false },
@@ -1122,6 +1130,7 @@ describe('two routes to one square', () => {
     geometry: { kind: 'limits' },
     baseOperationalRail: true,
     standing: [],
+    standingWest: 0,
     facility: null,
     modifiers: [],
     enhancements: [],