feat: add refactoring label bypass for check_pr_size

PRs with the 'refactoring' label bypass the PR size check, allowing
large but legitimate refactoring PRs. The check_pr_size CLI now accepts
--repo and --pr-number to query PR labels via the Gitea API.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.gitea/workflows/ci.yml

@@ -121,11 +121,14 @@ jobs:
         if: github.event_name == 'pull_request'
         env:
           PYTHONPATH: ${{ env.PYTHONPATH }}
+          CI_GITEA_API_TOKEN: ${{ secrets.CI_GITEA_API_TOKEN }}
         run: |
           . .venv/bin/activate 2>/dev/null || true
           python3 -m devx.ci.check_pr_size \
             --base "origin/master" \
             --head "${{ github.event.pull_request.head.sha || github.sha }}" \
+            --repo "${{ github.repository }}" \
+            --pr-number "${{ github.event.number }}" \
             --github-output
       # --- release-dry-run step (conditional) ---
       - name: Release dry-run validation