Add complete workspace cleanup before checkout

- Now clears entire workspace except .git directory before checkout
- Ensures absolutely clean state for every build
- Uses safe find command with error suppression
- Guarantees no leftover files from previous builds can interfere

Jenkinsfile

@@ -13,6 +13,17 @@ pipeline {
     }
     
     stages {
+        stage('Clean Workspace') {
+            steps {
+                echo "🧹 Cleaning entire workspace before checkout..."
+                sh '''
+                    # Remove everything except .git directory
+                    find . -mindepth 1 -maxdepth 1 ! -name '.git' -exec rm -rf {} + 2>/dev/null || true
+                    echo "Workspace completely cleaned"
+                '''
+            }
+        }
+        
         stage('Checkout') {
             steps {
                 echo "🔍 Checking out LSL project: ${PROJECT_NAME}"
@@ -20,17 +31,6 @@ pipeline {
             }
         }
         
-        stage('Clean Workspace') {
-            steps {
-                echo "🧹 Cleaning up processed files from previous builds..."
-                sh '''
-                    # Remove any processed files from previous builds
-                    rm -f processed_*.lsl
-                    echo "Workspace cleaned of processed files"
-                '''
-            }
-        }
-        
         stage('LSL Validation') {
             steps {
                 echo "🔧 Validating LSL syntax..."