Queue manager, drivers, and job contracts

Initial extraction snapshot from denosyscore monorepo as of 2026-02-14.

composer require denosyscore/queue

• src/Queue/*

composer validate --strict find src -type f -name '*.php' -print0 | xargs -0 -n1 php -l

• CI: composer validation + PHP syntax lint on push and pull requests.
• Release: GitHub release publication on semantic version tags.
• Dependabot: weekly Composer dependency update checks.