- Reposition sm-flow as orchestration harness over OpenSpec lifecycle
- Adopt 4 user commands (Actions, Not Phases) instead of phase numbers
- Rename all stages to English verbs (clarify through archive)
- Reorder execution: grill before specify to eliminate rework loops
- Simplify core rules from 19 to 6 hard constraints in SKILL.md
- Simplify conflict classification from 4 categories to 2+1
- Switch devflow strategy to decisions.md-only process log during execution
- Upgrade micro mode from artifact compression to gate merging
- Add observable outputs for quality constraints
- Add design review doc and user guide
- Append v4.0 changelog to workflow.md
