A Mission is a governed unit of engineering work. Its lifecycle is derived from workflow law and current task progress, not from a surface-owned checklist.

Stage Output
Intake BRIEF.md and initial Mission record
Requirements PRD.md
Specification SPEC.md and PLAN.md
Implementation Task-level changes and VERIFICATION.md evidence
Audit AUDIT.md and delivery readiness notes

The Running Mission instance owns lifecycle behavior while the Mission is live. It coordinates child Entities, applies the Mission workflow definition, evaluates gates, and publishes read data for Open Mission.

Open Mission can request commands. It does not own the lifecycle.