fix dead air strafe direction

packages/shared/test/dead-air.test.mjs

@@ -126,3 +126,20 @@ test("visible wardens expose pose but redact combat inventory", () => {
   assert.equal(replicated.magazine, null);
   assert.equal(replicated.reserve, null);
 });
+
+test("DEAD AIR strafe-right matches the first-person camera's screen right", () => {
+  const server = deadAirGame.createServer();
+  server.addPlayer(1);
+  const player = server.currentState.players.find((candidate) => candidate.id === 1);
+  player.x = 0;
+  player.z = 25;
+  player.yaw = 0;
+  assert.deepEqual(server.submitInput(1, {
+    sequence: 1,
+    targetTick: 1,
+    observedTick: 0,
+    input: input({ strafe: 1, yaw: 0 }),
+  }), { accepted: true });
+  server.step();
+  assert.ok(player.x < 0, `camera-right at yaw 0 should reduce world x, saw ${player.x}`);
+});