v0.3.1 — multiplayer groundwork: 13 engine tests covering 2-4 player games, a seat parameter on snapshot and actionMenu so a player sees their own railroad rather than seat 0's, and the 22 opponent-directed cards held out of every deck until they are built

test/setup.test.ts

@@ -62,8 +62,10 @@ describe('card catalogue (component 1)', () => {
     // Two entries are dealt ZERO copies and kept in the catalogue so the design stays visible:
     // Poling, whose effect is "TBD in the source", and the sharp curves, whose only difference from
     // an ordinary curve was a Move cost nothing ever charged.
+    // DECK_SIZE is the CATALOGUE, 235. The deck actually dealt is smaller: the 22 opponent-directed
+    // cards are held back in every mode until they are implemented, so `buildDeck` returns 213.
     assert.equal(DECK_SIZE, 235);
-    assert.equal(buildDeck().length, DECK_SIZE);
+    assert.equal(buildDeck().length, SOLITAIRE_DECK_SIZE);
   });
 
   it('matches the design deck composition exactly', () => {
@@ -89,14 +91,18 @@ describe('card catalogue (component 1)', () => {
   });
 
   it('removes opponent-directed cards from a solitaire deck', () => {
-    // Q6 — Space-use and Action cards can only be played AT another player, so in a one-player
-    // game they would be 22 of 235 draws (9%) that do nothing.
+    // Q6 took Space-use and Action cards out of solitaire, where they have no legal target. They are
+    // now out of the COMPETITIVE deck too, until they are implemented: `checkPlay` answers both
+    // categories NOT_IMPLEMENTED, so dealing them would make 22 of 235 draws (9%) reject outright.
     assert.equal(SOLITAIRE_DECK_SIZE, 213);
-    const solo = buildDeck('solitaire');
-    assert.equal(solo.length, SOLITAIRE_DECK_SIZE);
-    assert.ok(!solo.some((c) => c.kind.kind === 'spaceUse' || c.kind.kind === 'action'));
-    // A competitive deck keeps them. Poling and the sharp curves are dealt none.
-    assert.equal(buildDeck('competitive').length, 235);
+    for (const mode of ['solitaire', 'competitive'] as const) {
+      const deck = buildDeck(mode);
+      assert.equal(deck.length, SOLITAIRE_DECK_SIZE, `${mode} deck size`);
+      assert.ok(
+        !deck.some((c) => c.kind.kind === 'spaceUse' || c.kind.kind === 'action'),
+        `${mode} deck still holds opponent-directed cards`,
+      );
+    }
   });
 
   it('deals track FROM the deck, at the sheet\'s counts', () => {