feat: server tracks and broadcasts game time

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

server/src/game/GameLoop.ts

@@ -1,4 +1,4 @@
-import { TICK_RATE, BROADCAST_EVERY_N_TICKS } from '@dflike/shared';
+import { TICK_RATE, BROADCAST_EVERY_N_TICKS, ENERGY_DECAY_PER_TICK, DAY_NIGHT_RATIO } from '@dflike/shared';
 import { World } from '../ecs/World.js';
 import { GameMap } from '../map/GameMap.js';
 import { generateMap } from '../map/mapGenerator.js';
@@ -32,6 +32,7 @@ export class GameLoop {
     // Load terrain and decorations
     this.map.terrain = generated.terrain;
     this.map.decorations = generated.decorations;
+    this.map.trunkDecorations = generated.trunkDecorations;
     this.map.loadObstacles(generated.obstacles);
 
     // Points of interest from generator
@@ -86,4 +87,11 @@ export class GameLoop {
   getTick(): number {
     return this.tick;
   }
+
+  getGameTime(): number {
+    const dayTicks = 100 / ENERGY_DECAY_PER_TICK;
+    const nightTicks = dayTicks / DAY_NIGHT_RATIO;
+    const cycleTicks = dayTicks + nightTicks;
+    return (this.tick % cycleTicks) / cycleTicks;
+  }
 }

server/src/network/SocketServer.ts

@@ -23,7 +23,7 @@ export class SocketServer {
 
   private setupBroadcast(): void {
     this.gameLoop.setBroadcastHandler(() => {
-      const update = serializeStateUpdate(this.gameLoop.world, this.gameLoop.getTick());
+      const update = serializeStateUpdate(this.gameLoop.world, this.gameLoop.getTick(), this.gameLoop.getGameTime());
       this.io.emit('state-update', update);
     });
   }

server/src/network/stateSerializer.ts

@@ -80,10 +80,11 @@ export function serializeWorldState(world: World, map: GameMap): WorldState {
     pointsOfInterest: map.getPointsOfInterest(),
     terrain: map.terrain,
     decorations: map.decorations,
+    trunkDecorations: map.trunkDecorations,
   };
 }
 
-export function serializeStateUpdate(world: World, tick: number): StateUpdate {
+export function serializeStateUpdate(world: World, tick: number, gameTime: number): StateUpdate {
   const entities = world.query('position').map(id => serializeEntity(world, id));
-  return { entities, tick };
+  return { entities, tick, gameTime };
 }