Add wp cron-concurrent command for parallel cron execution

[Copilot]

Summary

A WP-CLI package that runs WordPress cron tasks concurrently instead of sequentially.

• Adds wp cron-concurrent run command that detects pending cron tasks and executes them in parallel subprocesses
• Live progress display with spinner, elapsed time, and last output line per task (running tasks shown first, finished afterwards)
• --filter=<string> option to run only hooks matching a substring
• --concurrent=<n> option to cap simultaneous tasks (default: 5)
• Integration test suite using wp-env
• GitHub Actions CI workflow

Usage

# Run all pending cron tasks concurrently
wp cron-concurrent run

# Run only WooCommerce hooks
wp cron-concurrent run --filter=woocommerce

# Limit to 3 concurrent tasks
wp cron-concurrent run --concurrent=3

Files

• src/CronConcurrent.php — Main command class using proc_open() with non-blocking I/O
• cron-concurrent.php — Plugin entry point with WordPress header for wp-env activation
• composer.json — WP-CLI package metadata
• .wp-env.json / wp-cli.yml / package.json — Development environment config
• tests/run-tests.sh — Integration tests (bash, run against real WordPress via wp-env)
• .github/workflows/test.yml — CI workflow

Test plan

• wp help cron-concurrent shows command and run subcommand
• --filter and --concurrent options documented in help
• Empty queue returns "No pending cron tasks found."
• Scheduled hooks are detected and executed
• Queue is empty after execution
• --filter only runs matching hooks, leaves others pending
• --concurrent=1 serializes execution correctly
• CI passes on GitHub Actions

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