- Replace W4-S3 (old lifecycle stepper) with new paper mode specs: status strip, overview card, discussion card, workflow toggles, files row, technical details
- Add W4-S4: workspace path detection keeps paper mode for fulltext.md
- Add W4-S5: global mode as system homepage
- Add W4-S6: workflow toggle checkboxes sync to Base via processFrontMatter (no extra sync needed)