diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 38720ed..d4d92da 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup Terraform
         uses: hashicorp/setup-terraform@v3
@@ -50,15 +50,15 @@ jobs:
         python-version: ['3.13']
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Cache pip packages
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
@@ -114,7 +114,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master
@@ -127,7 +127,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install yamllint
         run: pip install yamllint
@@ -150,7 +150,7 @@ jobs:
         service: [airflow, spark, jupyter]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -170,7 +170,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Check README
         run: |
@@ -203,7 +203,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Check Makefile exists
         run: |
@@ -226,7 +226,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Run Trivy vulnerability scanner
         uses: aquasecurity/trivy-action@master
@@ -250,7 +250,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Validate project structure
         run: |
@@ -315,7 +315,7 @@ jobs:
     needs: [terraform-validate, docker-build]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup Terraform
         uses: hashicorp/setup-terraform@v3
diff --git a/.github/workflows/platform-tests.yml b/.github/workflows/platform-tests.yml
index f5b25f1..1a97bfb 100644
--- a/.github/workflows/platform-tests.yml
+++ b/.github/workflows/platform-tests.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Test PowerShell script syntax
         run: |
@@ -63,7 +63,7 @@ jobs:
           terraform validate
 
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.13'
 
@@ -123,7 +123,7 @@ jobs:
     runs-on: macos-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Test bash script syntax
         run: |
@@ -186,7 +186,7 @@ jobs:
           terraform validate
 
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.13'
 
@@ -231,7 +231,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Test bash script syntax
         run: |
@@ -294,7 +294,7 @@ jobs:
           terraform validate
 
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.13'
 
@@ -340,7 +340,7 @@ jobs:
     needs: linux-integration-tests
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup Terraform
         uses: hashicorp/setup-terraform@v3
@@ -428,7 +428,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Verify platform guides exist
         run: |
diff --git a/.gitignore b/.gitignore
index c41099a..e6ae2c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -161,4 +161,6 @@ build/
 
 # Local development
 local/
-scratch/
\ No newline at end of file
+scratch/
+# Claude Code harness state
+.claude/