This adds a concise operator-facing checklist for REV004 covering current
mainline SHAs, environment prerequisites, smoke order, remaining cautions,
and the evidence index used for release and joint-debug work.
Constraint: Checklist must reflect verified mainline reality and remain short enough for frontline use
Rejected: Keep launch guidance scattered across evidence files only | too slow for release/joint-debug coordination
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Update this checklist only when mainline reality materially changes or a new blocker emerges
Tested: Cross-checked against current mainline summary, truth matrix, and evidence set
Not-tested: No document export/render pipeline executed for this checklist
tangweijie
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