close-issues workflow targets upstream repo in fork

[nicko-ai]

The scheduled close-issues workflow in VRSEN/agentswarm-cli fails because the script targets the upstream repo instead of the fork repo.

Evidence:

• Recent failed run: https://github.com/VRSEN/agentswarm-cli/actions/runs/26380910844
• .github/workflows/close-issues.yml runs script/github/close-issues.ts with the fork repo token.
• script/github/close-issues.ts hard-codes anomalyco/opencode, so the fork token does not have permission to comment on or close those issues.

Expected behavior:

• In GitHub Actions, the stale-issue script should target GITHUB_REPOSITORY.
• Local fallback behavior should target VRSEN/agentswarm-cli when GITHUB_REPOSITORY is absent, not upstream.