feat: add Stats and StatModifiers types to shared

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/src/types.ts

@@ -25,6 +25,33 @@ export interface Needs {
   energy: number; // 0-100
 }
 
+export interface Stats {
+  // Physical
+  strength: number;
+  dexterity: number;
+  constitution: number;
+  intelligence: number;
+  perception: number;
+  // Personality
+  sociability: number;
+  courage: number;
+  curiosity: number;
+  empathy: number;
+  temperament: number;
+}
+
+export type StatName = keyof Stats;
+
+export interface StatModifier {
+  stat: StatName;
+  value: number;
+  remaining: number;    // ticks remaining, -1 = permanent (needs-based, replaced each tick)
+}
+
+export interface StatModifiers {
+  modifiers: StatModifier[];
+}
+
 export type MovementState = 'idle' | 'walking';
 export type GoalType = 'wander' | 'eat' | 'rest';
 
@@ -65,6 +92,7 @@ export interface EntityState {
   movement: Movement;
   appearance: Appearance;
   needs?: Needs;
+  stats?: Stats;
   npcBrain?: NPCBrain;
   playerControlled?: PlayerControlled;
   name?: string; // NPC display name