[codex] Scope scheduler concurrency by PR - #133
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This was referenced Aug 6, 2026
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Fixes central PR Review Merge Scheduler queue behavior observed while draining newsdom-api PRs. The required scheduler workflow used one repository-wide concurrency group, so newer PR events could cancel the pending required workflow for the lowest-number PR before it received a runner. This scopes scheduler concurrency to the active PR number for pull_request_target/workflow_run events, with ref/run fallbacks for schedule/manual runs.\n\nVerification:\n- py -X dev scripts/ci/pr_review_merge_scheduler.py --self-test\n- py -m pytest tests/test_pr_review_merge_scheduler.py -q\n- static contract check for the PR-scoped concurrency expression