chore: add composer + phpunit dev scaffolding

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitattributes

@@ -0,0 +1,7 @@
+/tests export-ignore
+/docs export-ignore
+/phpunit.xml export-ignore
+/composer.json export-ignore
+/composer.lock export-ignore
+/.gitignore export-ignore
+/.gitattributes export-ignore

composer.json

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+{
+  "name": "sidelkin/cf7-spam-to-telegram",
+  "description": "Forwards CF7 spam submissions to Telegram",
+  "type": "wordpress-plugin",
+  "license": "GPL-2.0-or-later",
+  "require": {
+    "php": ">=7.4"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^9.6"
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "Cf7stg\\Tests\\": "tests/"
+    }
+  },
+  "scripts": {
+    "test": "phpunit"
+  },
+  "config": {
+    "sort-packages": true
+  }
+}

phpunit.xml

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+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd"
+         bootstrap="tests/bootstrap.php"
+         colors="true"
+         cacheResultFile=".phpunit.result.cache">
+    <testsuites>
+        <testsuite name="unit">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>

tests/bootstrap.php

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+<?php
+declare(strict_types=1);
+
+// Simple autoloader that mirrors the runtime plugin autoloader,
+// mapping Cf7stg\ClassName → includes/class-class-name.php
+spl_autoload_register(static function (string $class): void {
+    if (strpos($class, 'Cf7stg\\') !== 0) {
+        return;
+    }
+    $relative = substr($class, strlen('Cf7stg\\'));
+    // Turn "PhoneParser" into "phone-parser"
+    $slug = strtolower(preg_replace('/([a-z0-9])([A-Z])/', '$1-$2', $relative));
+    $path = __DIR__ . '/../includes/class-' . $slug . '.php';
+    if (is_file($path)) {
+        require_once $path;
+    }
+});
+
+// Minimal shims for functions used by pure-logic classes when WP is absent.
+if (!function_exists('apply_filters')) {
+    function apply_filters($tag, $value) { return $value; }
+}
+if (!function_exists('esc_html')) {
+    function esc_html($s) { return htmlspecialchars((string)$s, ENT_QUOTES, 'UTF-8'); }
+}
+if (!function_exists('esc_url')) {
+    function esc_url($s) { return filter_var((string)$s, FILTER_SANITIZE_URL); }
+}
+if (!function_exists('wp_strip_all_tags')) {
+    function wp_strip_all_tags($s) { return trim(strip_tags((string)$s)); }
+}
+if (!function_exists('__')) {
+    function __($text) { return $text; }
+}