Resume worm rides after advanced Sneak arrivals

tests/fixture-advanced-sneak-worm.ts

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+import assert from 'node:assert/strict';
+import { applyAction, createGame, newPlayer, type Action, type Game } from '../game/engine';
+import { baseDeck } from '../game/cards';
+import { createAmbassadors, placeAmbassador, type AmbassadorEffect } from '../game/ecaz-ambassadors';
+import { createTerrorState, placeTerror } from '../game/moritani-terror';
+
+export type WormSneakKind = 'direct' | 'overlap' | 'ambassador';
+export type WormOrder = 'terror' | 'ambassador';
+export const player = (game: Game, id: string) => {
+  const result = game.players.find(p => p.id === id); assert.ok(result); return result;
+};
+export const act = (game: Game, id: string, action: Action) => applyAction(structuredClone(game), id, action);
+
+/** Controlled Advanced worm position based on the existing overlap-worm
+ * fixture. Seats, forces, card deck, physical markers and the first and second
+ * rider decisions are staged; the accepted first ride and every subsequent
+ * force placement and decision are actual engine actions. */
+export function advancedSneakWormFixture(kind: WormSneakKind, first: WormOrder = 'terror', withBG = false) {
+  const game = createGame('ADVANCEDSNEAKWORM', newPlayer('ec', 'Ecaz', 'ecaz'), true, ['ecaz']);
+  game.players.push(newPlayer('m', 'Moritani', 'moritani'), newPlayer('in', 'Rider', 'fremen'));
+  if (withBG) game.players.push(newPlayer('bg', 'Bene Gesserit', 'beneGesserit'));
+  const order = first === 'terror' ? ['m','ec','in'] : ['ec','m','in'];
+  if (withBG) order.push('bg');
+  Object.assign(game, {status:'playing', phase:1, turn:3, storm:18, active:null,
+    order, movementRemaining:[...order], deck:baseDeck()});
+  for (const seat of game.players)
+    Object.assign(seat, {hand:[], spice:20, forces:{}, reserves:20});
+  player(game,'in').forces = {'imperial_basin:10':3, 'hagga_basin:12':1};
+  player(game,'in').reserves = 16;
+  const ambassadors = createAmbassadors(() => 0.2);
+  const effect: AmbassadorEffect = kind === 'direct' ? 'fremen' : kind === 'overlap' ? 'emperor' : 'guild';
+  const token = ambassadors.tokens.find(row => row.effect === effect); assert.ok(token);
+  ambassadors.cohort = [token.id,...ambassadors.tokens.filter(row => row.effect !== 'ecaz' && row.id !== token.id)
+    .slice(0,4).map(row => row.id)];
+  for (const row of ambassadors.tokens) {
+    row.zone = row.effect === 'ecaz' || ambassadors.cohort.includes(row.id) ? 'supply' : 'pool';
+    row.location = null;
+  }
+  game.ecazAmbassadors = placeAmbassador(ambassadors, token.id, {turn:2, availableSpice:20,
+    destination:{id:'arrakeen',stronghold:true,inStorm:false,allowed:true}}).state;
+  const terror = createTerrorState(() => 0.2), sneak = terror.tokens.find(row => row.kind === 'sneakAttack');
+  assert.ok(sneak);
+  const childTerritory = kind === 'ambassador' ? 'carthag' : 'arrakeen';
+  const childSector = kind === 'ambassador' ? 11 : 10;
+  game.moritaniTerror = placeTerror(terror, sneak.id, childTerritory, 1);
+  game.decision = {kind:'wormRide', player:'in', territory:'imperial_basin'};
+  game.wormRides = ['hagga_basin'];
+  const entry = act(game, 'in', {type:'decision', accept:true, territory:'arrakeen', sector:10,
+    forces:{'imperial_basin:10':2}});
+  return {game:entry, token:token.id, sneak:sneak.id, kind, first, withBG, childTerritory, childSector,
+    nextRide:{kind:'wormRide',player:'in',territory:'hagga_basin'} as const};
+}