_latest_main_ci_run() was using event != pull_request which still
matched deploy.yml schedule runs when their prettyref == "main",
blocking the loop from picking up new issues.
_latest_ci_run_for_branch() had the same issue: the else branch matched
any non-pull_request event including schedule runs.
Both functions now explicitly filter for event == "push" only.
Tests updated: rename _latest_ci_run → _latest_main_ci_run, mock
_open_issue_prs to prevent real API calls in unit tests, and update
_find_pr_for_branch side_effect to reflect the upstream post-merge
PR-still-open verification check.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
