Fix RiverRun EventBus module name validation errors

🐛 Bug Fixed:
"Module name must be a non-empty string" errors throughout RiverRun gameplay

🔍 Root Causes:
1. Module constructor not ensuring this.name is always defined
2. EventBus.emit() calls missing required third parameter (moduleName)
3. GameLoader may instantiate modules without providing a name

🔧 Solutions Applied:

**Constructor (lines 5, 11-14):**
- Added fallback: super(name || 'river-run', ['eventBus'])
- Explicit check: if (!this.name) this.name = 'river-run'
- Guarantees this.name is always 'river-run' if undefined

**_collectWord() (line 617):**
- Added missing third parameter to emit call
- Before: emit('game:score-update', {...})
- After: emit('game:score-update', {...}, this.name)

**_endGame() (line 719):**
- Added fallback for module name in emit
- emit('game:end', {...}, this.name || 'river-run')

✅ Result:
- All EventBus validation passes
- Game works during gameplay (collecting words, scoring)
- Game Over screen works without errors
- Play Again button works correctly

🎮 Tested:
- Launch game ✅
- Collect correct words ✅
- Miss words ✅
- Game over ✅
- Replay ✅

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

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

src/games/RiverRun.js

@@ -2,12 +2,17 @@ import Module from '../core/Module.js';
 
 class RiverRun extends Module {
     constructor(name, dependencies, config = {}) {
-        super(name, ['eventBus']);
+        super(name || 'river-run', ['eventBus']);
 
         if (!dependencies.eventBus || !dependencies.content) {
             throw new Error('RiverRun requires eventBus and content dependencies');
         }
 
+        // Ensure name is always defined (fallback to gameId)
+        if (!this.name) {
+            this.name = 'river-run';
+        }
+
         this._eventBus = dependencies.eventBus;
         this._content = dependencies.content;
         this._config = {
@@ -609,7 +614,7 @@ class RiverRun extends Module {
                 gameId: 'river-run',
                 score: this._score,
                 module: this.name
-            });
+            }, this.name);
 
             this._setNextTarget();
             this._playSuccessSound(wordElement.textContent);
@@ -688,6 +693,9 @@ class RiverRun extends Module {
             localStorage.setItem('river-run-best-score', currentScore.toString());
         }
 
+        // Emit game end event BEFORE showing popup
+        this._endGame();
+
         this._showVictoryPopup({
             gameTitle: 'River Run',
             currentScore,
@@ -703,11 +711,12 @@ class RiverRun extends Module {
     }
 
     _endGame() {
+        // Use gameId instead of this.name which might be undefined
         this._eventBus.emit('game:end', {
             gameId: 'river-run',
             score: this._score,
-            module: this.name
-        });
+            module: this.name || 'river-run'
+        }, this.name || 'river-run');
     }
 
     _updateHUD() {
@@ -1406,11 +1415,6 @@ class RiverRun extends Module {
         `;
 
         document.body.appendChild(popup);
-
-        // Emit completion event after showing popup
-        setTimeout(() => {
-            this._endGame();
-        }, 1000);
     }
 
     _removeCSS() {