diff --git a/.github/workflows/quality-gate.yml b/.github/workflows/quality-gate.yml
index 0d3ff14..d983984 100644
--- a/.github/workflows/quality-gate.yml
+++ b/.github/workflows/quality-gate.yml
@@ -57,11 +57,19 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-
 
-      - name: 📦 Install Dependencies
+      - name: 📦 Install Development Dependencies
         run: |
           python -m pip install --upgrade pip
+          pip install -r requirements-dev.txt
+
+      - name: 📦 Install Runtime Dependencies
+        run: |
           pip install -r ${{ steps.prepare-requirements.outputs.PROCESSED_REQUIREMENTS_FILE }}
-          pip install pytest pytest-cov pytest-asyncio
+
+      - name: 🔍 Run Code Validation
+        run: |
+          chmod +x validate.sh
+          ./validate.sh
 
       - name: 🧪 Run Tests with Pytest
         run: |
diff --git a/validate.sh b/validate.sh
index aeed301..c7c44fe 100755
--- a/validate.sh
+++ b/validate.sh
@@ -11,6 +11,27 @@ YELLOW='\033[1;33m'
 BLUE='\033[0;34m'
 NC='\033[0m' # No Color
 
+# Args
+FIX_MODE=false
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        --fix)
+            FIX_MODE=true
+            shift
+            ;;
+        -h|--help)
+            echo "Usage: $0 [--fix]"
+            echo "  --fix   Apply Ruff auto-fixes (format and lint fixes)."
+            exit 0
+            ;;
+        *)
+            echo -e "${RED}Unknown option: $1${NC}"
+            echo "Usage: $0 [--fix]"
+            exit 2
+            ;;
+    esac
+done
+
 echo -e "${BLUE}╔════════════════════════════════════════════════════════╗${NC}"
 echo -e "${BLUE}║  Model Manager - Code Validation Suite                ║${NC}"
 echo -e "${BLUE}╚════════════════════════════════════════════════════════╝${NC}"
@@ -47,12 +68,16 @@ run_step() {
 FAILED_STEPS=()
 
 # Step 1: Code Formatting Check (Ruff)
-if ! run_step "1. Code Formatting (Ruff)" "ruff format laborious/ tests/ && ruff format --check laborious/ tests/"; then
+# - default: check only
+# - --fix: write changes
+if ! run_step "1. Code Formatting (Ruff)" "if \$FIX_MODE; then ruff format laborious/ tests/; else ruff format --check laborious/ tests/; fi"; then
     FAILED_STEPS+=("Code Formatting")
 fi
 
 # Step 2: Linting (Ruff)
-if ! run_step "2. Code Linting (Ruff)" "ruff check --fix laborious/ tests/"; then
+# - default: check only
+# - --fix: apply autofixes
+if ! run_step "2. Code Linting (Ruff)" "if \$FIX_MODE; then ruff check --fix laborious/ tests/; else ruff check laborious/ tests/; fi"; then
     FAILED_STEPS+=("Linting")
 fi