This adds an operations-oriented checklist for REV004 covering environment
readiness, rollout order, smoke validation, rollback posture, and fast-path
triage hints for on-call and release engineers.
Constraint: Checklist must stay concise and executable for frontline release use
Rejected: Bury release steps across evidence and design docs only | too slow for runtime operations
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Update this checklist only when release-critical reality changes, not for every minor doc change
Tested: Cross-checked against final summary, go-live checklist, and current evidence set
Not-tested: No document export/render pipeline executed for this checklist
tangweijie
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