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>

composer.json

@@ -0,0 +1,87 @@
+{
+    "name": "descomplicar/kivicare-api",
+    "description": "REST API extension for KiviCare WordPress plugin - Healthcare management system",
+    "type": "wordpress-plugin",
+    "license": "GPL-2.0-or-later",
+    "authors": [
+        {
+            "name": "Descomplicar® Crescimento Digital",
+            "email": "dev@descomplicar.pt",
+            "homepage": "https://descomplicar.pt"
+        }
+    ],
+    "keywords": [
+        "wordpress",
+        "plugin",
+        "healthcare",
+        "api",
+        "kivicare",
+        "medical",
+        "clinic"
+    ],
+    "homepage": "https://descomplicar.pt",
+    "support": {
+        "issues": "https://github.com/descomplicar/kivicare-api/issues",
+        "source": "https://github.com/descomplicar/kivicare-api"
+    },
+    "require": {
+        "php": "^8.1",
+        "firebase/php-jwt": "^6.8"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^10.0",
+        "wp-coding-standards/wpcs": "^3.0",
+        "squizlabs/php_codesniffer": "^3.7",
+        "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
+        "phpcompatibility/php-compatibility": "^9.3",
+        "wp-cli/wp-cli": "^2.8",
+        "wp-cli/wp-cli-bundle": "^2.8",
+        "yoast/phpunit-polyfills": "^2.0"
+    },
+    "suggest": {
+        "wp-cli/wp-cli": "Required for WordPress testing environment setup"
+    },
+    "autoload": {
+        "psr-4": {
+            "KiviCare_API\\": "src/"
+        },
+        "files": [
+            "src/kivicare-api.php"
+        ]
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "KiviCare_API\\Tests\\": "tests/"
+        }
+    },
+    "config": {
+        "sort-packages": true,
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true
+        }
+    },
+    "scripts": {
+        "install-codestandards": [
+            "Dealerdirect\\Composer\\Plugin\\Installers\\PHPCodeSniffer\\Plugin::run"
+        ],
+        "phpcs": "phpcs",
+        "phpcbf": "phpcbf", 
+        "phpunit": "phpunit",
+        "test": [
+            "@phpcs",
+            "@phpunit"
+        ],
+        "post-install-cmd": [
+            "@install-codestandards"
+        ],
+        "post-update-cmd": [
+            "@install-codestandards"  
+        ]
+    },
+    "extra": {
+        "wordpress-install-dir": "vendor/wordpress/wordpress",
+        "wordpress-plugin-slug": "kivicare-api"
+    },
+    "minimum-stability": "stable",
+    "prefer-stable": true
+}