Add puck deceleration with drag and bounce reduction

Implemented ice friction physics for puck:
- Added PUCK_DRAG (200 px/s²) to simulate ice friction
- Reduced PUCK_BOUNCE from 1.0 to 0.6 for energy loss on collisions
- Puck now naturally decelerates when loose instead of bouncing forever

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/config/constants.ts

@@ -46,6 +46,8 @@ export const PUCK_PICKUP_RADIUS = 1.5;   // meters
 export const PUCK_CARRY_DISTANCE = 1.0;  // meters in front of player
 export const MAX_PUCK_VELOCITY = 50;     // m/s
 export const SHOT_SPEED = 30;            // m/s
+export const PUCK_DRAG = 200;            // pixels/s² - ice friction (decelerates puck over time)
+export const PUCK_BOUNCE = 0.6;          // bounce coefficient (loses energy on wall/board collisions)
 
 // Puck reception constants
 export const PUCK_RECEPTION_BASE_CHANCE = 0.8;    // Base chance to receive puck (modified by handling skill)

src/entities/Puck.ts

@@ -1,5 +1,5 @@
 import Phaser from 'phaser';
-import { SCALE, MAX_PUCK_VELOCITY, PUCK_RADIUS } from '../config/constants';
+import { SCALE, MAX_PUCK_VELOCITY, PUCK_RADIUS, PUCK_DRAG, PUCK_BOUNCE } from '../config/constants';
 import { CoordinateUtils } from '../utils/coordinates';
 import type { PuckState, TeamSide, Position } from '../types/game';
 
@@ -44,8 +44,11 @@ export class Puck extends Phaser.GameObjects.Container {
     // Set initial velocity to 0 (stationary)
     this.body.setVelocity(0, 0);
 
-    // Add bounce to keep it moving
+    // Add drag to simulate ice friction (puck decelerates over time)
-    this.body.setBounce(1, 1);
+    this.body.setDrag(PUCK_DRAG);
+
+    // Add bounce with energy loss on collisions
+    this.body.setBounce(PUCK_BOUNCE);
     this.body.setCollideWorldBounds(true);
 
     // Enable high-velocity collision detection

src/game/GameScene.ts

@@ -165,7 +165,7 @@ export class GameScene extends Phaser.Scene {
 
   private createPuck() {
     // Initialize puck at center ice (0, 0 in game coordinates)
-    this.puck = new Puck(this, 27, 5);
+    this.puck = new Puck(this, 5, 0);
 
     // Add collisions between puck and all goal posts with custom bounce handler
     this.physics.add.collider(this.puck, this.goalPostsGroup, this.handlePuckPostBounce, undefined, this);