feat: complete task breakdown and checklist

- Generated comprehensive tasks.md with 16 major tasks and 94+ subtasks
- Created interactive CHECKLIST.md with progress tracking and dashboard
- Updated implementation plan with security-validated tech stack
- Added phase-by-phase breakdown with dependencies and success criteria
- Ready for Phase 0: Security Foundation & Environment Setup

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.specify/memory/constitution.md

@@ -0,0 +1,128 @@
+# Constitution - Care Book Block Ultimate
+
+## Project Identity
+**Name**: Care Book Block Ultimate
+**Type**: WordPress Plugin
+**Domain**: Healthcare Appointment Management
+**Integration**: KiviCare Plugin
+
+## Core Principles
+
+### 1. WordPress Integration First
+- NEVER modify core WordPress or KiviCare files
+- Use hooks, filters, and WordPress APIs exclusively
+- Follow WordPress Coding Standards (WPCS)
+- Maintain plugin isolation and compatibility
+
+### 2. CSS-First Performance
+- Inject CSS to hide elements immediately
+- Use PHP hooks for data filtering as secondary layer
+- Minimize JavaScript dependencies
+- Target <5% performance overhead
+
+### 3. Security-First Development
+- Sanitize ALL input data
+- Escape ALL output data
+- Use WordPress nonces for AJAX
+- Implement proper capability checks
+- Follow OWASP security guidelines
+
+### 4. Database Architecture
+- Custom table: wp_care_booking_restrictions
+- Proper indexing for scalability
+- Use WordPress $wpdb with prepared statements
+- Implement efficient caching with WordPress Transients
+
+### 5. Testing Strategy
+- RED-GREEN-Refactor methodology
+- Contract tests before implementation
+- Integration tests for WordPress/KiviCare compatibility
+- Unit tests for individual components
+- Performance benchmarking
+
+## Technical Constraints
+
+### Performance Requirements
+- Appointment page loading: <5% overhead
+- Admin AJAX responses: <200ms
+- Restriction toggles: <300ms (including cache)
+- Scalability: Support thousands of doctors/services
+
+### Compatibility Requirements
+- PHP: 7.4+ minimum
+- WordPress: 5.0+ minimum
+- KiviCare: 3.0.0+ minimum
+- MySQL: 5.7+ minimum
+
+### Code Standards
+- PHP: WordPress Coding Standards + PSR-4 autoloading
+- JavaScript: WordPress JS Standards
+- CSS: WordPress Admin styling patterns
+- Database: Prepared statements mandatory
+
+## Architectural Decisions
+
+### Data Layer
+- Custom table for restrictions data
+- WordPress Transients for caching
+- Selective cache invalidation
+- Proper database indexes
+
+### Integration Layer
+- WordPress hooks/filters exclusively
+- AJAX for admin interactions
+- REST API endpoints where appropriate
+- Event-driven architecture
+
+### Presentation Layer
+- CSS-first element hiding
+- WordPress Admin UI patterns
+- Mobile-responsive design
+- Accessibility compliance (WCAG 2.1)
+
+### Security Layer
+- Input validation and sanitization
+- Output escaping
+- Capability-based access control
+- Nonce verification for state changes
+
+## Development Workflow
+
+### Testing Cycle
+1. Write failing contract test
+2. Write failing integration test
+3. Write failing unit test
+4. Implement minimal code to pass
+5. Refactor while keeping tests green
+6. Performance verification
+7. Security audit
+
+### Deployment Process
+1. Code review and approval
+2. Automated testing suite
+3. Performance benchmarking
+4. Security scanning
+5. Staging environment validation
+6. Production deployment
+7. Post-deployment monitoring
+
+## Quality Gates
+
+### Code Quality
+- All tests pass (unit, integration, contract)
+- Code coverage >80%
+- No security vulnerabilities
+- Performance benchmarks met
+- WordPress VIP compliance
+
+### Documentation
+- API documentation complete
+- User guide updated
+- Technical architecture documented
+- Deployment instructions current
+
+---
+
+**Last Updated**: 2025-09-12
+**Version**: 1.0
+**Review Cycle**: Monthly or on major changes