Add Symfony Package Radar source files

blueprints/symfony-package-radar/README.md

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+# Symfony Package Radar Blueprint
+
+This directory contains a PHP-only Symfony demo for WordPress Playground.
+
+- `blueprint.json` loads the demo without downloading WordPress (`preferredVersions.wp: false`).
+- `symfony-package-radar.zip` is the bundled app used by the Blueprint.
+- `source/wordpress/` contains the reviewable source used to build the ZIP.
+
+To rebuild the ZIP:
+
+```bash
+rm -rf .context/symfony-package-radar-build
+mkdir -p .context/symfony-package-radar-build
+cp -R blueprints/symfony-package-radar/source/wordpress/. \
+  .context/symfony-package-radar-build/
+(
+  cd .context/symfony-package-radar-build/symfony-package-radar
+  composer install --no-dev --no-interaction --no-progress --prefer-dist --optimize-autoloader
+)
+rm -f blueprints/symfony-package-radar/symfony-package-radar.zip
+(
+  cd .context/symfony-package-radar-build
+  zip -X -qr ../../blueprints/symfony-package-radar/symfony-package-radar.zip \
+    index.php symfony-package-radar \
+    -x 'symfony-package-radar/var/cache/*' 'symfony-package-radar/var/log/*'
+)
+```

blueprints/symfony-package-radar/source/wordpress/index.php

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+<?php
+if (isset($_GET['playground-redirection-handler'], $_GET['next'])) {
+    header('Location: ' . $_GET['next'], true, 302);
+    exit;
+}
+
+$path = parse_url($_SERVER['REQUEST_URI'] ?? '/', PHP_URL_PATH) ?: '/';
+$target = '/symfony-package-radar/public/index.php';
+if ($path !== '/' && !str_starts_with($path, '/symfony-package-radar/')) {
+    $target .= $path;
+}
+
+header('Location: ' . $target, true, 302);

blueprints/symfony-package-radar/source/wordpress/symfony-package-radar/composer.json

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+{
+	"name": "playground/symfony-package-radar",
+	"type": "project",
+	"require": {
+		"php": ">=8.4.1",
+		"symfony/framework-bundle": "8.1.*",
+		"symfony/http-client": "8.1.*",
+		"symfony/twig-bundle": "8.1.*",
+		"wp-php-toolkit/html": "^0.8.1"
+	},
+	"autoload": {
+		"psr-4": {
+			"App\\": "src/"
+		}
+	},
+	"config": {
+		"sort-packages": true
+	}
+}