fix(review): address audit findings before merge

src/data/gameplay/gameStageAnchors.ts

@@ -0,0 +1,18 @@
+import type { Vector3Tuple } from "@/types/three/three";
+
+export interface StageAnchorConfig {
+  color: string;
+  position: Vector3Tuple;
+  scale?: number;
+}
+
+export const INTRO_STAGE_ANCHOR: StageAnchorConfig = {
+  color: "#7dd3fc",
+  position: [0, 4, 0],
+};
+
+export const OUTRO_STAGE_ANCHOR: StageAnchorConfig = {
+  color: "#fb7185",
+  position: [0, 6, 10],
+  scale: 1.25,
+};