Check the run token on every prefetched chunk

Chunks of an earlier controller run's copy still in flight could land in a newer run's copy of the same generation. Every chunk now carries the token, and the scenario ignores a chunk whose token differs from its record's.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

plugins/player_sync/test/instance.js

@@ -277,7 +277,7 @@ describe("player_sync", function() {
 			const sent = lib.escapeString(JSON.stringify(Object.fromEntries(enabled.map(c => [c, true]))));
 			return chunks.map((chunk, i) => "/sc player_sync.prefetch_inventory(" +
 				`'test',${playerData.generation},'${lib.escapeString(chunk)}',${i + 1},${chunks.length}` +
-				`${i === 0 ? `,'${sent}','tok'` : ""})`);
+				`${i === 0 ? `,'${sent}','tok'` : ",nil,'tok'"})`);
 		}
 
 		it("should send prefetch_inventory chunks with the generation and the full recipe list", async function() {
@@ -296,11 +296,11 @@ describe("player_sync", function() {
 			assert.ok(commands.length > 1, "more than one chunk");
 			assert.deepEqual(instance.server.rconCommands, commands);
 		});
-		it("should send the token with the first chunk only", async function() {
+		it("should send the token with every chunk", async function() {
 			await prefetch({ generation: 3, name: "test" });
 			const commands = instance.server.rconCommands;
 			assert.ok(commands[0].endsWith(",'tok')"));
-			assert.ok(commands.slice(1).every(command => !command.includes("tok")));
+			assert.ok(commands.length > 1 && commands.slice(1).every(command => command.endsWith(",nil,'tok')")));
 		});
 		it("should stop when the save refuses the first chunk", async function() {
 			const playerData = { generation: 3, name: "test" };