Clamp pet wander to lower-third ground zone.

Restrict Y to 66–90% and X to 15–85% with bottom-anchored positioning so the avatar stays on grass instead of sky or walls.

lib/pet-wander-bounds.ts

@@ -0,0 +1,14 @@
+/** Percentage bounds for pet wander within the LCD viewport. */
+export const PET_WANDER_BOUNDS = {
+  /** Horizontal inset — keep pet off side walls */
+  minX: 15,
+  maxX: 85,
+  /** Lower third of LCD — ground where hills/grass/floor render */
+  minY: 66,
+  maxY: 90,
+} as const;
+
+export const PET_WANDER_START = {
+  x: 50,
+  y: 78,
+} as const;