chore(deps): bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/01-lint.yml

@@ -166,7 +166,7 @@ jobs:
 
     steps:
       - name: 📥 Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: 🐍 Set up Python 3.12
         if: |

.github/workflows/02-security.yml

@@ -28,7 +28,7 @@ jobs:
     steps:
       # 0️⃣ Checkout source code with full history for secret scanning
       - name: 📥 Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0  # Need full history to scan all commits
 
@@ -46,7 +46,7 @@ jobs:
     steps:
       # 0️⃣ Checkout source code with full history
       - name: 📥 Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0  # Need full history for differential scanning
 
@@ -66,7 +66,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 📥 Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: 🔍 Scan Python dependencies (pyproject.toml, poetry.lock)
         uses: aquasecurity/trivy-action@master
@@ -90,7 +90,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 📥 Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: 🔍 Scan Node dependencies (package.json, package-lock.json)
         uses: aquasecurity/trivy-action@master

.github/workflows/03-build-secure.yml

@@ -47,7 +47,7 @@ jobs:
 
     steps:
       - name: 📥 Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: 🧹 Free Up Disk Space
         run: |

.github/workflows/04-pytest.yml

@@ -44,7 +44,7 @@ jobs:
     steps:
       # 0️⃣ Checkout source code
       - name: 📥 Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       # 1️⃣ Setup Python environment
       - name: 🐍 Set up Python

.github/workflows/05-ci.yml

@@ -29,7 +29,7 @@ jobs:
   test-isolation:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Python
         uses: actions/setup-python@v4
@@ -84,7 +84,7 @@ jobs:
       EMBEDDING_MODEL: sentence-transformers/all-minilm-l6-v2
       DATA_DIR: /tmp/test-data
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Python
         uses: actions/setup-python@v4

.github/workflows/06-weekly-security-audit.yml

@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - name: 📥 Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: 🧹 Free Up Disk Space
         run: |
@@ -122,7 +122,7 @@ jobs:
     if: always()
     steps:
       - name: 📥 Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: 📥 Download Security Reports
         uses: actions/download-artifact@v4

.github/workflows/07-frontend-lint.yml

@@ -33,7 +33,7 @@ jobs:
     steps:
       # 0️⃣ Checkout source code
       - name: 📥 Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       # 1️⃣ Setup Node.js environment
       - name: 📦 Setup Node.js

.github/workflows/ai-issue-triage.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
 

.github/workflows/claude-code-review.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 1
 

.github/workflows/claude.yml

@@ -31,7 +31,7 @@ jobs:
       actions: read
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 1