diff --git a/.github/workflows/build-base-images.yml b/.github/workflows/build-base-images.yml
index de6e8f86..78c14803 100644
--- a/.github/workflows/build-base-images.yml
+++ b/.github/workflows/build-base-images.yml
@@ -57,7 +57,7 @@ jobs:
         df -h
     
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
@@ -146,7 +146,7 @@ jobs:
         df -h
     
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
diff --git a/.github/workflows/cache-cleanup.yml b/.github/workflows/cache-cleanup.yml
index be42eea1..5bce29d7 100644
--- a/.github/workflows/cache-cleanup.yml
+++ b/.github/workflows/cache-cleanup.yml
@@ -37,7 +37,7 @@ jobs:
       
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Analyze cache usage
       id: analysis
@@ -112,7 +112,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Cleanup old caches
       run: |
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 712ec801..84da99bb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,7 +40,7 @@ jobs:
       docker: ${{ steps.changes.outputs.docker }}
       dependencies: ${{ steps.changes.outputs.dependencies }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dorny/paths-filter@v3
         id: changes
         with:
@@ -77,7 +77,7 @@ jobs:
       should-build: ${{ steps.check-cache.outputs.should-build }}
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
@@ -190,7 +190,7 @@ jobs:
       continue-on-error: true
       
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     # Conditional Python setup - only if not using container
     - name: Set up Python 3.11 (fallback)
@@ -207,7 +207,7 @@ jobs:
     # Multi-level caching strategy
     - name: Cache Python packages (L1 - pip cache)
       if: ${{ needs.prepare-base-images.outputs.should-build == 'true' || needs.prepare-base-images.outputs.python-image == '' }}
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ env.CACHE_VERSION }}-${{ hashFiles('**/requirements*.txt', 'requirements-test.txt') }}
@@ -217,7 +217,7 @@ jobs:
 
     - name: Cache Python packages (L2 - site-packages)
       if: ${{ needs.prepare-base-images.outputs.should-build == 'true' || needs.prepare-base-images.outputs.python-image == '' }}
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           ~/.local/lib/python${{ env.PYTHON_VERSION }}/site-packages
@@ -228,7 +228,7 @@ jobs:
           ${{ runner.os }}-site-packages-
 
     - name: Cache test artifacts
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           ai-engine/.pytest_cache
@@ -439,7 +439,7 @@ jobs:
     # Cache management removed - not using Docker buildx cache
 
     - name: Upload test results
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       if: always()
       with:
         name: test-results-${{ matrix.test-suite }}
@@ -469,7 +469,7 @@ jobs:
       should-build: ${{ steps.check-cache.outputs.should-build }}
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Calculate Node dependencies hash
       id: deps-hash
@@ -521,7 +521,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Node.js 20
       uses: actions/setup-node@v6
@@ -530,7 +530,7 @@ jobs:
 
     # Multi-level caching for Node.js
     - name: Cache Node.js packages (L1 - npm cache)
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ~/.npm
         key: ${{ runner.os }}-npm-cache-${{ env.CACHE_VERSION }}-${{ hashFiles('frontend/package-lock.json') }}
@@ -539,7 +539,7 @@ jobs:
           ${{ runner.os }}-npm-cache-
 
     - name: Cache Node.js packages (L2 - node_modules)
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           node_modules
@@ -552,7 +552,7 @@ jobs:
 
     - name: Cache build artifacts
       if: matrix.test-type == 'build'
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           frontend/dist
@@ -601,7 +601,7 @@ jobs:
         esac
 
     - name: Upload frontend test results
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       if: always() && matrix.upload-artifacts == 'true'
       with:
         name: frontend-test-results-${{ matrix.test-type }}
@@ -640,7 +640,7 @@ jobs:
     needs: [integration-tests, frontend-tests, prepare-base-images, prepare-node-base]
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Calculate performance metrics
       id: metrics
diff --git a/.github/workflows/claude-code-review.yml b/.github/workflows/claude-code-review.yml
index ab07e492..3c55836f 100644
--- a/.github/workflows/claude-code-review.yml
+++ b/.github/workflows/claude-code-review.yml
@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 
diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
index 2e3e6df3..01f3e8c0 100644
--- a/.github/workflows/claude.yml
+++ b/.github/workflows/claude.yml
@@ -26,7 +26,7 @@ jobs:
       actions: read # Required for Claude to read CI results on PRs
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 648f793e..44629356 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -43,7 +43,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v6
@@ -56,13 +56,13 @@ jobs:
         node-version: '20.19.0'
 
     - name: Cache Python dependencies
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements*.txt') }}
 
     - name: Cache Node dependencies
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ~/.npm
         key: ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}
@@ -156,7 +156,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Run Trivy vulnerability scanner
       uses: aquasecurity/trivy-action@master
@@ -188,7 +188,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
@@ -237,7 +237,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Setup SSH
       uses: webfactory/ssh-agent@v0.9.1
diff --git a/.github/workflows/docker-publish.yml b/.github/workflows/docker-publish.yml
index a20d0c71..b516982b 100644
--- a/.github/workflows/docker-publish.yml
+++ b/.github/workflows/docker-publish.yml
@@ -22,7 +22,7 @@ jobs:
             dockerfile: ./ai-engine/Dockerfile
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index dfeb2998..d77c0a90 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -15,7 +15,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       
       - name: Setup Node.js
         uses: actions/setup-node@v6
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e34e42f7..e406a7ec 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,7 +12,7 @@ jobs:
       contents: write
     
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     
     - name: Create Release
       uses: softprops/action-gh-release@v2
diff --git a/.github/workflows/test-optimization.yml b/.github/workflows/test-optimization.yml
index 618ef080..c6b9f2c4 100644
--- a/.github/workflows/test-optimization.yml
+++ b/.github/workflows/test-optimization.yml
@@ -35,7 +35,7 @@ jobs:
     
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
diff --git a/.github/workflows/validate-workflows.yml b/.github/workflows/validate-workflows.yml
index 0d471d50..d106d301 100644
--- a/.github/workflows/validate-workflows.yml
+++ b/.github/workflows/validate-workflows.yml
@@ -13,7 +13,7 @@ jobs:
     
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       
       - name: Validate YAML syntax
         run: |