Pacts are honored; Swap Meet trades items, not card names (rev 26)

The pact fix: a clockwork no longer attacks a wizard it holds a BUDDY
pact on — Eric watched one sign the pact and punch him the next turn.
A pact is torn up for exactly one thing: a kill. And the post-attack
pact is signed only by a wizard who wants OUT of the fight (hauling
gold, bleeding, or with other enemies left) — a healthy duelist keeps
its options, and mutual-pact stalemates stay out of bot wars.

Swap Meet drops the 'name a card' prompt for a real trade picker:
click the other trader, choose one of your carried items, then claim
one of their displayed items. Rules rev 26 widens the engine's match
from object-typed cards to every movable object (daggers, rocks,
wands, stones); older games matched narrowly and replay so.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0138A8CjeQRpvzKxuMfz1Bqc

packages/engine/test/expansion-combat.test.ts

@@ -335,3 +335,33 @@ describe("ambushes (async interrupts)", () => {
     expect(state.ambushes.length).toBe(0);
   });
 });
+
+describe("swap meet trades carried items (rules rev 26)", () => {
+  function rig(deckRev: number) {
+    let { state } = createGame({ playerIds: ["alice", "bob"], seed: 42, sets: ["basic", "expansion1"], deckRev });
+    state = toRound2(state);
+    const { attacker, defender } = faceOff(state);
+    const sm = giveCard(state, attacker, "swap-meet");
+    giveCard(state, attacker, "dagger", "D", 1);
+    giveCard(state, defender, "blaster-wand", "W", 0);
+    state = must(state, attacker, {
+      type: "cast", instanceId: sm.instanceId,
+      target: { kind: "player", playerId: defender },
+      params: { cardId: "dagger;blaster-wand" },
+    });
+    state = must(state, defender, { type: "pass" });
+    return { state, attacker, defender };
+  }
+
+  it("a dagger trades for a wand — both are carried items", () => {
+    const { state, attacker, defender } = rig(26);
+    expect(state.players.find((p) => p.id === attacker)!.hand.some((c) => c.cardId === "blaster-wand")).toBe(true);
+    expect(state.players.find((p) => p.id === defender)!.hand.some((c) => c.cardId === "dagger")).toBe(true);
+  });
+
+  it("older revisions matched only object-typed cards and replay so", () => {
+    const { state, attacker, defender } = rig(25);
+    expect(state.players.find((p) => p.id === attacker)!.hand.some((c) => c.cardId === "dagger")).toBe(true);
+    expect(state.players.find((p) => p.id === defender)!.hand.some((c) => c.cardId === "blaster-wand")).toBe(true);
+  });
+});