docs: consolidate and restructure documentation architecture

- Remove outdated root-level documentation files
  - Delete IMPLEMENTATION_STATUS.md, WORK_IN_PROGRESS.md, UI_IMPROVEMENTS_SUMMARY.md, CLAUDE.md

- Reorganize documentation into docs/ folder
  - Move UNIFIED_EDITOR_EXPERIENCES.md → docs/unified-editor-experiences.md
  - Move DATATABLE_MIGRATION_PROGRESS.md → docs/datatable-migration-progress.md
  - Move SEED_SCRIPT_README.md → docs/seed-script-readme.md

- Create comprehensive new documentation
  - Add docs/implementation-status.md with production readiness assessment
  - Add docs/work-in-progress.md with active development tracking
  - Add docs/development-achievements.md consolidating all major accomplishments

- Update documentation hub
  - Enhance docs/README.md with complete 13-document structure
  - Organize into logical categories: Core, Status, Achievements
  - Provide clear navigation and purpose for each document

Features:
- 73% code reduction achievement through unified editor experiences
- Complete DataTable migration with enterprise features
- Comprehensive seed database with realistic research scenarios
- Production-ready status with 100% backend, 95% frontend completion
- Clean documentation architecture supporting future development

Breaking Changes: None - documentation restructuring only
Migration: Documentation moved to docs/ folder, no code changes required

docs/README.md

@@ -57,6 +57,48 @@ This documentation suite provides everything needed to understand, build, deploy
    - Robot plugin implementation
    - Security considerations for robot communication
 
+### Development Status & Progress
+
+8. **[Implementation Status](./implementation-status.md)**
+   - Overall project completion status
+   - Feature implementation tracking
+   - Architecture overview and achievements
+   - Production readiness assessment
+   - Deployment checklist
+
+9. **[Work in Progress](./work-in-progress.md)**
+   - Current development tasks
+   - Sprint planning and goals
+   - Technical debt tracking
+   - Active issues and blockers
+   - Team coordination notes
+
+### Implementation Achievements
+
+10. **[Unified Editor Experiences](./unified-editor-experiences.md)**
+    - Standardized form patterns across all entities
+    - EntityForm component architecture
+    - Code reduction achievements (73% duplication elimination)
+    - Consistent user experience implementation
+
+11. **[DataTable Migration Progress](./datatable-migration-progress.md)**
+    - Complete data management overhaul
+    - Unified DataTable component implementation
+    - Performance improvements and responsive design
+    - Migration completion status
+
+12. **[Seed Script Documentation](./seed-script-readme.md)**
+    - Development database setup
+    - Comprehensive test data scenarios
+    - Default login credentials
+    - Realistic research workflow examples
+
+13. **[Development Achievements](./development-achievements.md)**
+    - Comprehensive project completion summary
+    - Major achievement consolidation from all development phases
+    - Code reduction metrics and quality improvements
+    - Production readiness validation and deployment status
+
 ## 🚀 Quick Start for Developers
 
 ### Prerequisites