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

test/track.test.ts

@@ -15,7 +15,7 @@ import type {
   TrackCard,
   TurnoutOrientation,
 } from '../src/engine/state.ts';
-import { coordKey, isOperationalRail } from '../src/engine/state.ts';
+import { coordKey, isOperationalRail, turnOf } from '../src/engine/state.ts';
 import { createGame } from '../src/engine/setup.ts';
 import { applyIntent, areaOf } from '../src/engine/apply.ts';
 import type { MoveContext, Occupancy, Port } from '../src/engine/track.ts';
@@ -134,7 +134,7 @@ function areaFrom(cards: Record<string, TrackCard>, officeCoord: GridCoord): Off
   const grid = new Map<string, TrackCard>();
   for (const [k, v] of Object.entries(cards)) grid.set(k, v);
   return {
-    owner: 0,
+    seat: 0,
     tier: 'whistlePost',
     grid,
     officeCoord,
@@ -682,12 +682,12 @@ describe('coupling lifts only the cars the crew ran over', () => {
       // A local CREW, which is what this test is about — `trainNumber: null`. It used to say train 1,
       // the Crack Limited, which prints "no switching" (§7) and may not make this move at all.
       id: 'crew', trainNumber: null, trainIsExtra: false, engineAt: 0, consist: [],
-      direction: 'west', facing: 'w', position: { at: 'grid', owner: 0, coord: { row: 0, col: 0 } }, movesUsed: 0,
+      direction: 'west', facing: 'w', position: { at: 'grid', seat: 0, coord: { row: 0, col: 0 } }, movesUsed: 0,
     });
     s.clock.phase = 'localOps';
     s.clock.currentActor = 0;
-    s.turn.option = 'switch';
-    s.turn.movesRemaining = 6;
+    turnOf(s, 0).option = 'switch';
+    turnOf(s, 0).movesRemaining = 6;
 
     const r = applyIntent(s, 0, { type: 'switch.move', trayId: 'crew', to: { row: 0, col: -1 }, reverse: false });
     assert.ok(r.ok, 'the move should be legal');
@@ -927,12 +927,12 @@ describe('backing up does not turn the train around', () => {
     s.trays.set(id, {
       id, trainNumber: null, trainIsExtra: false, engineAt: 0,
       consist: [], direction: 'east', facing: 'e',
-      position: { at: 'grid', owner: 0, coord: at(0, 1) }, movesUsed: 0,
+      position: { at: 'grid', seat: 0, coord: at(0, 1) }, movesUsed: 0,
     } as never);
     s.clock.phase = 'localOps';
     s.clock.currentActor = 0;
-    s.turn.option = 'switch';
-    s.turn.movesRemaining = 6;
+    turnOf(s, 0).option = 'switch';
+    turnOf(s, 0).movesRemaining = 6;
 
     // Running forward, east: the engine leads, so it still points east.
     assert.ok(applyIntent(s, 0, { type: 'switch.move', trayId: id, to: at(0, 2), reverse: false }).ok);