Add wp cron-concurrent command for parallel cron execution

.github/workflows/test.yml

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+name: Test
+
+on:
+  push:
+    branches:
+      - trunk
+  pull_request:
+
+jobs:
+  test:
+    name: Integration tests (wp-env)
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 'lts/*'
+
+      - name: Install Node.js dependencies
+        run: npm install
+
+      # Cache the wp-env working directory (~/.wp-env) so that the WordPress
+      # download and database setup are reused across runs when nothing changes.
+      - name: Cache wp-env
+        uses: actions/cache@v4
+        with:
+          path: ~/.wp-env
+          key: wp-env-${{ hashFiles('package.json', '.wp-env.json') }}
+          restore-keys: |
+            wp-env-
+
+      - name: Start wp-env
+        run: npx wp-env start
+
+      - name: Run tests
+        run: npm test
+
+      - name: Stop wp-env
+        run: npx wp-env stop
+        if: always()

.gitignore

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+node_modules/
+vendor/
+.wp-env/
+composer.lock
+package-lock.json

.wp-env.json

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+{
+    "plugins": ["."],
+    "mappings": {
+        "wp-cli.yml": "./wp-cli.yml"
+    },
+    "testsEnvironment": false
+}

composer.json

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+{
+    "name": "dd32/wpcli-cron-concurrent",
+    "description": "Runs WordPress cron tasks concurrently via wp-cli.",
+    "type": "wp-cli-package",
+    "keywords": ["wp-cli", "cron", "concurrent"],
+    "license": "MIT",
+    "require": {
+        "wp-cli/wp-cli": "^2.0"
+    },
+    "autoload": {
+        "classmap": ["src/"],
+        "files": ["cron-concurrent.php"]
+    },
+    "extra": {
+        "commands": [
+            "cron-concurrent",
+            "cron-concurrent run"
+        ]
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
+}

cron-concurrent.php

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+<?php
+/**
+ * Plugin Name: WP-CLI Cron Concurrent
+ * Description: Runs WordPress cron tasks concurrently via wp-cli.
+ * Version: 1.0.0
+ * Author: dd32
+ * License: MIT
+ */
+
+/**
+ * WP-CLI Cron Concurrent – entry point.
+ *
+ * Loaded automatically by WP-CLI when this package is installed via Composer,
+ * or explicitly via `--require` / a `wp-cli.yml` require entry.
+ * Registers the `wp cron-concurrent` command group.
+ *
+ * @package dd32/wpcli-cron-concurrent
+ */
+
+if ( ! class_exists( 'WP_CLI' ) ) {
+	return;
+}
+
+// When installed as a Composer package the classmap autoloader already
+// handles this file; the direct require is only a safety-net for manual
+// --require usage (e.g. inside wp-env test containers).
+if ( ! class_exists( 'CronConcurrent' ) ) {
+	require_once __DIR__ . '/src/CronConcurrent.php';
+}
+
+WP_CLI::add_command( 'cron-concurrent', 'CronConcurrent' );

package.json

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+{
+    "name": "wpcli-cron-concurrent",
+    "description": "Runs WordPress cron tasks concurrently via wp-cli.",
+    "private": true,
+    "scripts": {
+        "env:start": "wp-env start",
+        "env:stop": "wp-env stop",
+        "env:destroy": "wp-env destroy",
+        "test": "bash tests/run-tests.sh"
+    },
+    "devDependencies": {
+        "@wordpress/env": "^11.0.0"
+    }
+}