feat: resource collection with E-key interaction (Phase 4.3)

Mineral veins yield metals (Fe, Cu, Zn, Au, Sn), geysers yield S/H.
Resources spawn as ECS entities with gold/orange dot sprites on tiles.
E-key collects nearest resource in range into inventory. Resources
deplete after collection. Visual feedback text. 12 new tests (174 total).

Co-authored-by: Cursor <cursoragent@cursor.com>

src/scenes/GameScene.ts

@@ -15,6 +15,9 @@ import { playerInputSystem } from '../player/input';
 import { tileCollisionSystem, buildWalkableSet } from '../player/collision';
 import { findSpawnPosition } from '../player/spawn';
 import { createPlayerEntity } from '../player/factory';
+import { Inventory } from '../player/inventory';
+import { interactionSystem, type ResourceInfo } from '../player/interaction';
+import { spawnResources } from '../world/resources';
 import type { InputState } from '../player/types';
 
 export class GameScene extends Phaser.Scene {
@@ -26,9 +29,11 @@ export class GameScene extends Phaser.Scene {
 
   // Player state
   private playerEid!: number;
+  private inventory!: Inventory;
   private walkableSet!: Set<number>;
   private worldGrid!: number[][];
   private tileSize!: number;
+  private resourceData!: Map<number, ResourceInfo>;
   private keys!: {
     W: Phaser.Input.Keyboard.Key;
     A: Phaser.Input.Keyboard.Key;
@@ -37,6 +42,11 @@ export class GameScene extends Phaser.Scene {
     E: Phaser.Input.Keyboard.Key;
   };
 
+  // Interaction feedback
+  private interactionText!: Phaser.GameObjects.Text;
+  private interactionTimer = 0;
+  private wasEDown = false;
+
   constructor() {
     super({ key: 'GameScene' });
   }
@@ -59,18 +69,24 @@ export class GameScene extends Phaser.Scene {
     this.worldGrid = worldData.grid;
     this.tileSize = biome.tileSize;
 
-    // 5. Create player at spawn position
+    // 5. Spawn resource entities (mineral veins, geysers)
+    this.resourceData = spawnResources(
+      this.gameWorld.world, worldData.grid, biome, this.worldSeed,
+    );
+
+    // 6. Create player at spawn position + inventory
     const spawn = findSpawnPosition(worldData.grid, biome.tileSize, this.walkableSet);
     const spawnX = spawn?.x ?? (biome.mapWidth * biome.tileSize) / 2;
     const spawnY = spawn?.y ?? (biome.mapHeight * biome.tileSize) / 2;
     this.playerEid = createPlayerEntity(this.gameWorld.world, spawnX, spawnY);
+    this.inventory = new Inventory(500, 20);
 
-    // 6. Camera — follow player, zoom via scroll wheel
+    // 7. Camera — follow player, zoom via scroll wheel
     const worldPixelW = biome.mapWidth * biome.tileSize;
     const worldPixelH = biome.mapHeight * biome.tileSize;
     setupPlayerCamera(this, worldPixelW, worldPixelH);
 
-    // Sync bridge to create player sprite, then attach camera follow
+    // Sync bridge to create sprites, then attach camera follow to player
     this.bridge.sync(this.gameWorld.world);
     const playerSprite = this.bridge.getSprite(this.playerEid);
     if (playerSprite) {
@@ -78,7 +94,7 @@ export class GameScene extends Phaser.Scene {
       this.cameras.main.startFollow(playerSprite, true, 0.1, 0.1);
     }
 
-    // 7. Keyboard input
+    // 8. Keyboard input
     const keyboard = this.input.keyboard;
     if (!keyboard) throw new Error('Keyboard plugin not available');
     this.keys = {
@@ -89,10 +105,10 @@ export class GameScene extends Phaser.Scene {
       E: keyboard.addKey('E'),
     };
 
-    // 8. Minimap
+    // 9. Minimap
     this.minimap = new Minimap(this, worldData);
 
-    // 9. UI stats overlay
+    // 10. UI overlay
     this.statsText = this.add.text(10, 10, '', {
       fontSize: '12px',
       color: '#00ff88',
@@ -102,6 +118,21 @@ export class GameScene extends Phaser.Scene {
     });
     this.statsText.setScrollFactor(0);
     this.statsText.setDepth(100);
+
+    // Interaction feedback text (center-bottom of screen)
+    this.interactionText = this.add.text(
+      this.cameras.main.width / 2, this.cameras.main.height - 40, '', {
+        fontSize: '14px',
+        color: '#ffdd44',
+        fontFamily: 'monospace',
+        backgroundColor: '#000000cc',
+        padding: { x: 6, y: 3 },
+      },
+    );
+    this.interactionText.setScrollFactor(0);
+    this.interactionText.setOrigin(0.5);
+    this.interactionText.setDepth(100);
+    this.interactionText.setAlpha(0);
   }
 
   update(_time: number, delta: number): void {
@@ -130,24 +161,66 @@ export class GameScene extends Phaser.Scene {
       this.walkableSet,
     );
 
-    // 6. Health / death
+    // 6. Resource interaction (E key, debounced — manual edge detection)
+    const isEDown = this.keys.E.isDown;
+    const justPressedE = isEDown && !this.wasEDown;
+    this.wasEDown = isEDown;
+    const interaction = interactionSystem(
+      this.gameWorld.world, justPressedE, this.inventory, this.resourceData,
+    );
+    if (interaction) {
+      this.showInteractionFeedback(interaction.type, interaction.itemId);
+    }
+
+    // 7. Health / death
     const dead = healthSystem(this.gameWorld.world);
     for (const eid of dead) {
       removeGameEntity(this.gameWorld.world, eid);
     }
 
-    // 7. Render sync
+    // 8. Render sync
     this.bridge.sync(this.gameWorld.world);
 
-    // 8. Minimap viewport
+    // 9. Minimap viewport
     this.minimap.update(this.cameras.main);
 
-    // 9. Stats
+    // 10. Fade interaction text
+    if (this.interactionTimer > 0) {
+      this.interactionTimer -= delta;
+      if (this.interactionTimer <= 0) {
+        this.interactionText.setAlpha(0);
+      }
+    }
+
+    // 11. Stats
     const fps = delta > 0 ? Math.round(1000 / delta) : 0;
     const px = Math.round(Position.x[this.playerEid]);
     const py = Math.round(Position.y[this.playerEid]);
+    const invWeight = Math.round(this.inventory.getTotalWeight());
+    const invSlots = this.inventory.slotCount;
     this.statsText.setText(
-      `seed: ${this.worldSeed} | ${fps} fps | pos: ${px},${py} | WASD move, E interact, scroll zoom`,
+      `seed: ${this.worldSeed} | ${fps} fps | pos: ${px},${py} | inv: ${invSlots} items, ${invWeight} AMU | WASD/E/scroll`,
     );
   }
+
+  private showInteractionFeedback(type: string, itemId?: string): void {
+    let msg = '';
+    switch (type) {
+      case 'collected':
+        msg = `+1 ${itemId ?? ''}`;
+        break;
+      case 'depleted':
+        msg = `+1 ${itemId ?? ''} (depleted)`;
+        break;
+      case 'inventory_full':
+        msg = `Inventory full! Can't pick up ${itemId ?? ''}`;
+        break;
+      case 'nothing_nearby':
+        msg = 'Nothing to interact with nearby';
+        break;
+    }
+    this.interactionText.setText(msg);
+    this.interactionText.setAlpha(1);
+    this.interactionTimer = 1500; // fade after 1.5s
+  }
 }