Fix phase numbering throughout documentation

- Removed all references to Phase 0 (should be Documentation prerequisite)
- Updated phase transitions from 'Phase 3→4' to 'Phase 3 to Phase 4'
- Ensured all phases are numbered 1-4 consistently
- Documentation for brownfield projects is now correctly referred to as 'Documentation prerequisite' rather than Phase 0

src/modules/bmm/docs/README.md

@@ -104,7 +104,7 @@ Essential reference materials:
 
 **Work with existing codebase (brownfield)**
 → Read [Brownfield Development Guide](./brownfield-guide.md)
-→ Pay special attention to Phase 0 documentation requirements
+→ Pay special attention to documentation requirements for brownfield projects
 
 **Understand planning tracks and methodology**
 → See [Scale Adaptive System](./scale-adaptive-system.md)