feat: add shared types and constants for ECS, networking, and assets

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

shared/src/constants.ts

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+export const TILE_SIZE = 48;
+export const WORLD_WIDTH = 64;
+export const WORLD_HEIGHT = 64;
+export const TICK_RATE = 10; // server ticks per second
+export const BROADCAST_EVERY_N_TICKS = 3; // state broadcast frequency
+export const SPRITE_FRAME_WIDTH = 48;
+export const SPRITE_FRAME_HEIGHT = 48;
+export const SPRITE_COLS = 6;
+export const SPRITE_ROWS = 4;
+
+// NPC needs
+export const HUNGER_DECAY_PER_TICK = 0.05;
+export const ENERGY_DECAY_PER_TICK = 0.03;
+export const HUNGER_THRESHOLD = 30;
+export const ENERGY_THRESHOLD = 20;
+export const NEED_RECOVERY_RATE = 0.5;
+
+// Directions (row index in spritesheet)
+export const Direction = {
+  DOWN: 0,
+  LEFT: 1,
+  RIGHT: 2,
+  UP: 3,
+} as const;
+export type Direction = (typeof Direction)[keyof typeof Direction];
+
+// Accessory slot names in z-order (bottom to top rendering)
+export const ACCESSORY_SLOTS = [
+  'bottom', 'feet', 'chest', 'arm', 'shoulder',
+  'waist', 'back', 'facialHair', 'haircut', 'hat',
+] as const;
+export type AccessorySlot = (typeof ACCESSORY_SLOTS)[number];

shared/src/index.ts

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+export * from './constants.js';
+export * from './types.js';

shared/src/types.ts

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+import type { AccessorySlot } from './constants.js';
+
+// Entity is just a numeric ID
+export type EntityId = number;
+
+// Components
+export interface Position {
+  x: number;
+  y: number;
+}
+
+export interface Velocity {
+  dx: number;
+  dy: number;
+}
+
+export interface Appearance {
+  skinId: string; // e.g. "shape00_skin02"
+  accessories: Partial<Record<AccessorySlot, string>>; // slot -> filename without extension
+}
+
+export interface Needs {
+  hunger: number; // 0-100
+  energy: number; // 0-100
+}
+
+export type MovementState = 'idle' | 'walking';
+export type GoalType = 'wander' | 'eat' | 'rest';
+
+export interface Movement {
+  state: MovementState;
+  target: Position | null;
+  path: Position[];
+  direction: number; // Direction enum value
+}
+
+export interface PlayerControlled {
+  playerId: string;
+  mode: 'avatar' | 'camera';
+}
+
+export interface NPCBrain {
+  currentGoal: GoalType | null;
+  goalQueue: GoalType[];
+}
+
+// Network protocol messages
+export interface EntityState {
+  id: EntityId;
+  position: Position;
+  movement: Movement;
+  appearance: Appearance;
+  needs?: Needs;
+  npcBrain?: NPCBrain;
+  playerControlled?: PlayerControlled;
+}
+
+export interface WorldState {
+  entities: EntityState[];
+  worldWidth: number;
+  worldHeight: number;
+  tileSize: number;
+  obstacles: Position[];
+  pointsOfInterest: { type: 'food' | 'rest'; position: Position }[];
+}
+
+export interface StateUpdate {
+  entities: EntityState[];
+  tick: number;
+}
+
+export interface PlayerJoined {
+  playerId: string;
+  entityId: EntityId;
+}
+
+export interface PlayerLeft {
+  playerId: string;
+}
+
+export interface PlayerInput {
+  type: 'move' | 'toggle-mode' | 'follow' | 'interact';
+  direction?: { dx: number; dy: number };
+  targetPlayerId?: string;
+  targetEntityId?: EntityId;
+}
+
+// Server -> Client events
+export interface ServerEvents {
+  'world-state': (data: WorldState) => void;
+  'state-update': (data: StateUpdate) => void;
+  'player-joined': (data: PlayerJoined) => void;
+  'player-left': (data: PlayerLeft) => void;
+  'npc-recomposed': (data: { entityId: EntityId; appearance: Appearance }) => void;
+}
+
+// Client -> Server events
+export interface ClientEvents {
+  'player-input': (data: PlayerInput) => void;
+}