ci: use PROJECT_TOKEN for org project access

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/auto-project.yml

@@ -4,10 +4,6 @@ on:
   issues:
     types: [opened, labeled]
 
-permissions:
-  issues: read
-  repository-projects: write
-
 jobs:
   add-to-project:
     runs-on: ubuntu-latest
@@ -17,18 +13,18 @@ jobs:
         uses: actions/add-to-project@v1.0.2
         with:
           project-url: https://github.com/orgs/host-uk/projects/2
-          github-token: ${{ secrets.GITHUB_TOKEN }}
+          github-token: ${{ secrets.PROJECT_TOKEN }}
 
       - name: Add to Core.GO (lang:go label)
         if: contains(github.event.issue.labels.*.name, 'lang:go')
         uses: actions/add-to-project@v1.0.2
         with:
           project-url: https://github.com/orgs/host-uk/projects/4
-          github-token: ${{ secrets.GITHUB_TOKEN }}
+          github-token: ${{ secrets.PROJECT_TOKEN }}
 
       - name: Add to Core.Framework (scope:arch label)
         if: contains(github.event.issue.labels.*.name, 'scope:arch')
         uses: actions/add-to-project@v1.0.2
         with:
           project-url: https://github.com/orgs/host-uk/projects/1
-          github-token: ${{ secrets.GITHUB_TOKEN }}
+          github-token: ${{ secrets.PROJECT_TOKEN }}