Fold wordpress-importer download into download-wp-server-files

Register the wordpress-importer plugin as an entry in the existing
FILES_TO_DOWNLOAD registry instead of a standalone script, reusing the shared
fetch/extract/retry plumbing. No behavior change; the plugin still downloads
into wp-files/ at install time and ships in the CLI bundle.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -30,7 +30,7 @@
 		"start": "npm -w studio-app run start",
 		"start:test": "DEV_CONFIG_DIR=/tmp/studio-test npm -w studio-app run start",
 		"start-wayland": "npm -w studio-app run start-wayland",
-		"postinstall": "patch-package --patch-dir apps/studio/patches && node ./scripts/remove-fs-ext-other-platform-binaries.mjs && tsx ./scripts/download-wp-server-files.ts && node ./scripts/download-available-site-translations.mjs && tsx ./scripts/download-agent-skills.ts && tsx ./scripts/download-wordpress-importer.ts && tsx ./scripts/download-php-binary.ts",
+		"postinstall": "patch-package --patch-dir apps/studio/patches && node ./scripts/remove-fs-ext-other-platform-binaries.mjs && tsx ./scripts/download-wp-server-files.ts && node ./scripts/download-available-site-translations.mjs && tsx ./scripts/download-agent-skills.ts && tsx ./scripts/download-php-binary.ts",
 		"package": "tsx ./scripts/package-in-isolation.ts package",
 		"make": "tsx ./scripts/package-in-isolation.ts make",
 		"make:windows-x64": "tsx ./scripts/package-in-isolation.ts make:windows-x64",
@@ -60,7 +60,6 @@
 		"test:metrics": "npx playwright test --config=./tools/metrics/playwright.metrics.config.ts",
 		"download-language-packs": "tsx ./scripts/download-language-packs.ts",
 		"download-agent-skills": "tsx ./scripts/download-agent-skills.ts",
-		"download-wordpress-importer": "tsx ./scripts/download-wordpress-importer.ts",
 		"download:php-binary": "tsx ./scripts/download-php-binary.ts",
 		"eval": "npm run cli:build --silent && npx promptfoo@0.121.4 eval -c scripts/eval/promptfoo.config.yaml",
 		"eval:view": "npx promptfoo@0.121.4 view"

scripts/download-wp-server-files.ts

@@ -24,6 +24,9 @@ async function fetchWithRetry( name: string, url: string ): Promise< Buffer > {
 }
 
 const WP_SERVER_FILES_PATH = path.join( import.meta.dirname, '..', 'wp-files' );
+
+// Pinned so builds are reproducible. Bump deliberately.
+const WORDPRESS_IMPORTER_VERSION = '0.9.5';
 const PHPMYADMIN_PATCH_FILES_PATH = path.join( import.meta.dirname, '..', 'apps', 'cli', 'php' );
 const PHPMYADMIN_LOCAL_PATCH_FILES = new Map< string, string >( [
 	[ 'config.inc.php', path.join( PHPMYADMIN_PATCH_FILES_PATH, 'config.inc.php' ) ],
@@ -116,6 +119,13 @@ const FILES_TO_DOWNLOAD: FileToDownload[] = [
 		getUrl: () => PHPMYADMIN_DOWNLOAD_URL,
 		destinationPath: path.join( WP_SERVER_FILES_PATH, 'phpmyadmin' ),
 	},
+	{
+		name: 'wordpress-importer',
+		description: `wordpress-importer ${ WORDPRESS_IMPORTER_VERSION }`,
+		getUrl: () =>
+			`https://downloads.wordpress.org/plugin/wordpress-importer.${ WORDPRESS_IMPORTER_VERSION }.zip`,
+		destinationPath: WP_SERVER_FILES_PATH,
+	},
 	{
 		name: 'reprint',
 		description: `reprint.phar`,