chore(deps): bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/deploy-docs.yml

@@ -19,7 +19,7 @@ jobs:
     name: Build documentation site
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - uses: actions/setup-python@v6
         with:

.github/workflows/drift-check.yml

@@ -14,7 +14,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: TMHSDigital/Developer-Tools-Directory/.github/actions/drift-check@v1.9
         with:
           mode: self

.github/workflows/label-sync.yml

@@ -13,7 +13,7 @@ jobs:
     name: Auto-label by path
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Get changed files
         id: files

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
     name: Bump version, tag, and release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/update-unity-api.yml

@@ -13,7 +13,7 @@ jobs:
     name: Refresh MCP data files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - uses: actions/setup-python@v6
         with:

.github/workflows/validate.yml

@@ -14,7 +14,7 @@ jobs:
     name: Validate JSON files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Validate plugin.json
         run: python3 -c "import json; json.load(open('.cursor-plugin/plugin.json'))"
@@ -96,7 +96,7 @@ jobs:
     name: Validate plugin manifest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Check required manifest fields
         run: |
@@ -137,7 +137,7 @@ jobs:
     name: Validate skill files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Check SKILL.md frontmatter
         run: |
@@ -190,7 +190,7 @@ jobs:
     name: Validate rule files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Check .mdc frontmatter
         run: |
@@ -235,7 +235,7 @@ jobs:
     name: Validate content quality
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Check for em dashes and en dashes
         run: |
@@ -282,7 +282,7 @@ jobs:
     name: Validate templates
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Check template structure
         run: |
@@ -323,7 +323,7 @@ jobs:
     name: Validate content counts
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Check content counts match README
         run: |
@@ -370,7 +370,7 @@ jobs:
     name: Validate MCP server
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - uses: actions/setup-python@v6
         with: