diff --git a/.github/workflows/agent-orchestrator.yml b/.github/workflows/agent-orchestrator.yml
index 6cc9046..b50d3eb 100644
--- a/.github/workflows/agent-orchestrator.yml
+++ b/.github/workflows/agent-orchestrator.yml
@@ -15,7 +15,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fcdaccb..09e3348 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index cea2de4..1314dae 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -16,7 +16,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Checkout
-              uses: actions/checkout@v4
+              uses: actions/checkout@v6
             - name: Initialize CodeQL
               uses: github/codeql-action/init@v3
               with:
diff --git a/.github/workflows/full-automation-ci.yml b/.github/workflows/full-automation-ci.yml
index eebcb61..484d786 100644
--- a/.github/workflows/full-automation-ci.yml
+++ b/.github/workflows/full-automation-ci.yml
@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v4
@@ -72,7 +72,7 @@ jobs:
     needs: verify-environment
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v4
@@ -112,7 +112,7 @@ jobs:
     needs: code-quality
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v4
@@ -146,7 +146,7 @@ jobs:
     if: github.event.inputs.skip_security != 'true'
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v4
@@ -184,7 +184,7 @@ jobs:
     needs: security-scan
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v4
@@ -224,7 +224,7 @@ jobs:
     if: github.ref == 'refs/heads/main' && github.event_name != 'pull_request'
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Download build artifacts
         uses: actions/download-artifact@v3
@@ -274,7 +274,7 @@ jobs:
     if: always()
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Generate automation report
         run: |
@@ -334,7 +334,7 @@ jobs:
     if: github.event.inputs.run_full_suite == 'true'
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup PowerShell for automation
         shell: pwsh
diff --git a/.github/workflows/lv_cad-ci.yml b/.github/workflows/lv_cad-ci.yml
index 746a3e0..bdc1f4f 100644
--- a/.github/workflows/lv_cad-ci.yml
+++ b/.github/workflows/lv_cad-ci.yml
@@ -26,7 +26,7 @@ jobs:
       QT_QPA_PLATFORM: offscreen
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/maintenance.yml b/.github/workflows/maintenance.yml
index 105a40e..8ae7427 100644
--- a/.github/workflows/maintenance.yml
+++ b/.github/workflows/maintenance.yml
@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -63,7 +63,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -144,7 +144,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/open-pr-chore-dev-setup-warnings.yml b/.github/workflows/open-pr-chore-dev-setup-warnings.yml
index ad9197f..54a579e 100644
--- a/.github/workflows/open-pr-chore-dev-setup-warnings.yml
+++ b/.github/workflows/open-pr-chore-dev-setup-warnings.yml
@@ -14,7 +14,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Create or update PR
         uses: actions/github-script@v7
diff --git a/.github/workflows/performance.yml b/.github/workflows/performance.yml
index 09dd6db..d7073f6 100644
--- a/.github/workflows/performance.yml
+++ b/.github/workflows/performance.yml
@@ -12,7 +12,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v6
 
             - name: Set up Python 3.11
               uses: actions/setup-python@v5
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 1503139..4e285ed 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -9,7 +9,7 @@ jobs:
   build-windows:
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: '3.11'
diff --git a/.github/workflows/seed-issues.yml b/.github/workflows/seed-issues.yml
index bdee957..2af5996 100644
--- a/.github/workflows/seed-issues.yml
+++ b/.github/workflows/seed-issues.yml
@@ -17,7 +17,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Create labels and issues from seed file
         uses: actions/github-script@v7