v0.4.0 — multiplayer Phases 0 and 1: seat and player split apart, turn state per player, the page behind a Session, and eight seat/player mix-ups fixed with tests that fail without them

src/sim/stats.ts

@@ -18,7 +18,7 @@
 import type { GameEvent } from '../engine/events.ts';
 import type { Intent } from '../engine/intents.ts';
 import type { GameState } from '../engine/state.ts';
-import { areaOf, facilityCarTypes } from '../engine/apply.ts';
+import { areaAtSeat, areaOf, facilityCarTypes } from '../engine/apply.ts';
 import { officeProfile } from '../engine/content.ts';
 
 // ---------------------------------------------------------------------------
@@ -121,7 +121,7 @@ export function makeFunnelProbe(player = 0): {
     // A buried engine is a per-decision condition: every turn it persists is a turn the train is
     // stuck, so this counts turns rather than trains.
     for (const tray of s.trays.values()) {
-      if (tray.position.at !== 'grid' || tray.position.owner !== player) continue;
+      if (tray.position.at !== 'grid' || tray.position.seat !== player) continue;
       if (tray.engineAt <= 0 || tray.engineAt >= tray.consist.length) continue;
       funnel.buriedTurns += 1;
       // Cars may never be set out at the Office (§A.4), which is where this almost always happens.
@@ -295,7 +295,10 @@ export function summarize(
   const grossPassenger = rev.passengerBoard + rev.passengerDetrain;
   const gross = grossFreight + grossPassenger;
 
-  const area = final.officeAreas.get(0);
+  // Seat 0 explicitly: these are SOLITAIRE summaries, where there is exactly one Office Area and
+  // seat 0 is the only player. `areaAtSeat` rather than `officeAreas.get` so the key's meaning is
+  // stated — a multi-player report would have to sum over seats, and would fail loudly here first.
+  const area = areaAtSeat(final, 0);
   let freightFacilities = 0;
   if (area) {
     for (const card of area.grid.values()) {