Three fixes in the upstream-sync workflow:
1. Replace github.token with CLAUDE_BOT_TOKEN in the check-upstream
job. The default runner token on Forgejo doesn't have issue-write
permissions, so issues were silently failing to create.
2. Output the tracking issue number from check-upstream and pass it
to the merge-upstream job. Claude's prompt now includes the issue
reference and instructs it to add "Closes #N" in the PR body.
3. Capture the issue number from both create and update paths so
the merge job always has it available.
Also cleaned up 6 duplicate upstream-sync labels created by previous
runs that used the unprivileged token.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
