chore(ci): surface bun exit code with ::warning:: on failure

[niStee]

Summary

Wrap the bun script/github/close-prs.ts invocation in .github/workflows/close-prs.yml so a non-zero exit code emits a ::warning:: annotation visible in the run log.

Fixes #42157

Problem

When the close-prs bun script fails (GraphQL pagination error, token-scope error, unhandled exception), the workflow step fails silently — the error is buried in the full log with no visible annotation in the run summary. This makes diagnosing close-prs failures harder than necessary.

Fix

bun script/github/close-prs.ts "${args[@]}" || {
  exit_code=$?
  echo "::warning::close-prs.ts exited with code $exit_code — check logs for GraphQL/token-scope errors"
  exit $exit_code
}

The exit code is still propagated (exit $exit_code), so the workflow step still fails — but now the failure reason is visible at a glance in the run summary via the ::warning:: annotation.

Verification

• Pre-commit hooks passed
• The change is in the workflow YAML, not the TypeScript script itself — no test changes needed
• Tested on the fork niStee/opencode (same workflow file, same failure mode observed in run Enhance custom commands #13)

[github-actions]

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[github-actions]

Hey! Your PR title ci(close-prs): surface bun exit code with ::warning:: on failure doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

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[github-actions]

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[github-actions]

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[niStee]

@anomalyco not sure what's still missing regarding your contributing guidelines.