docs: add v2.0 architecture and implementation plan
- Add comprehensive widget dashboard system design - Add schema system architecture with ECS pattern - Add detailed implementation plan with 8 epics - Include task breakdown with checkboxes for progress tracking - Document widget development guide - Document formula engine and YAML schema format - Add migration strategy and backward compatibility plan - Estimate 12-14 weeks total development time This branch will contain all v2.0 development work: - Widget dashboard with drag-and-drop - Schema system with YAML definitions - Formula engine with @ references - Schema-driven widgets - AI integration updates - Mobile responsive improvements Each epic builds on the previous with clear dependencies. All features designed for progressive enhancement without modes.
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