chore: add spec-kit and standardize signatures

- Added GitHub spec-kit for development workflow
- Standardized file signatures to Descomplicar® format
- Updated development configuration

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

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

CLAUDE.md

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+# care-api Development Guidelines
+
+Auto-generated from all feature plans. Last updated: 2025-09-12
+
+## Active Technologies
+- PHP 8.1+ WordPress plugin development (001-care-api-sistema)
+- WordPress REST API framework with JWT authentication
+- KiviCare 35-table database schema integration
+- PHPUnit testing with WordPress testing framework
+
+## Project Structure
+```
+src/
+├── models/          # KiviCare entity models
+├── services/        # Business logic services
+├── endpoints/       # REST API endpoint handlers
+├── auth/           # JWT authentication service
+└── utils/          # Helper utilities
+
+tests/
+├── contract/       # API contract tests
+├── integration/    # Database integration tests
+└── unit/          # Unit tests
+```
+
+## Commands
+# WordPress/PHP specific commands
+wp plugin activate kivicare-api
+wp config set WP_DEBUG true
+vendor/bin/phpunit tests/
+wp db query "SELECT..."
+
+## Code Style
+- WordPress coding standards (WPCS)
+- PSR-4 autoloading for classes
+- WordPress hooks and filters for extensibility
+- Prepared SQL statements for security
+
+## Recent Changes
+- 001-care-api-sistema: Added REST API for KiviCare healthcare management system
+
+<!-- MANUAL ADDITIONS START -->
+<!-- MANUAL ADDITIONS END -->