[hellopablo]

What

• RETRY log line: it printed the job's old available_at, because the worker discarded the job returned by retryJob(). It now prints the new due time.
• Idle backoff: an idle worker slept for a fixed QUEUE_WORKER_WAIT_TIME. It now doubles the wait on each empty poll, up to 5000ms (Work::MAX_WAIT_TIME), and starts again after a job. This is what the README described.
• README: shortened to a summary that links to the new documentation. It also states that the built-in priority queue needs a worker process of its own.

Behaviour change

A job pushed to an idle worker can now wait up to about five seconds before it is picked up, where before it waited about half a second. Set QUEUE_WORKER_WAIT_TIME higher than 5000 to raise the cap, or revert the second hunk in Work.php to keep a fixed poll.

Testing

php -l passes. The change is in the worker loop, which needs a database, so it has not been run against a live worker. phpunit and phpstan report the same two errors on develop as on this branch (Nails\FindReplace\Interfaces\Exclusion not found, from a stale vendor copy of module-find-replace).

Documentation: nails/docs, branch feature/queue-docs. The backoff behaviour is described there, so the two should merge together.

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