wan-huiyan-overnight-workflows

Overnight autonomous workflow that takes a cluster of related GitHub issues (typically a P1 review-panel finding set) and ships them to merged stacked PRs by morning. Builds on subagent-driven-development with overnight-specific discipline: stacked PRs (so PR2 doesn't wait on a human PR1-merge mid-night), pre-flight tracker-id audit (concurrent sessions on main steal IDs), final PR-level code review before proposing merge, review findings preserved as PR comments before squash. Sister to overnight-review-client-delivery and overnight-insight-discovery. v1.2.0 adds Phase 0 for unvalidated backlogs: stale-issue triage biased against dismissal, owner cut-line ratification, rulings baked as issue comments, and a wave-ordered kickoff prompt.