Fix PRT writer permissions for fork PRs

Restore label and comment synchronization after the PRT migration by granting the downstream writer workflows the pull request permission required for fork-originated PRs.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 512eb347-ec89-4250-8bf1-87048974b01d

.github/workflows/contributor-check-writer.yml

@@ -8,7 +8,7 @@ on:
 permissions:
   actions: read
   issues: write
-  pull-requests: read
+  pull-requests: write
 
 concurrency:
   group: ccw-${{ github.event.workflow_run.head_repository.id || 'unknown-repo' }}-${{ github.event.workflow_run.head_branch || 'unknown-branch' }}

.github/workflows/external-plugin-pr-quality-gates-writer.yml

@@ -9,7 +9,7 @@ permissions:
   actions: read
   contents: read
   issues: write
-  pull-requests: read
+  pull-requests: write
 
 concurrency:
   group: epqw-${{ github.event.workflow_run.head_repository.id || 'unknown-repo' }}-${{ github.event.workflow_run.head_branch || 'unknown-branch' }}

.github/workflows/label-pr-intent-writer.yml

@@ -8,7 +8,7 @@ on:
 permissions:
   actions: read
   issues: write
-  pull-requests: read
+  pull-requests: write
 
 concurrency:
   group: lpiw-${{ github.event.workflow_run.head_repository.id || 'unknown-repo' }}-${{ github.event.workflow_run.head_branch || 'unknown-branch' }}

.github/workflows/pr-duplicate-check-writer.yml

@@ -8,7 +8,7 @@ on:
 permissions:
   actions: read
   issues: write
-  pull-requests: read
+  pull-requests: write
 
 concurrency:
   group: pdcw-${{ github.event.workflow_run.head_repository.id || 'unknown-repo' }}-${{ github.event.workflow_run.head_branch || 'unknown-branch' }}