Skeleton: ship marko/log with the file and stream handlers (LOG_HANDLERS=file by default) #640

Problem

Since #608 (PR #633), marko/queue requires marko/log, and marko/log needs a handler package to write anywhere. The skeleton, which almost every app starts from, installs no log package. So a new app that runs a queue worker fails at startup with NoDriverException, and apps generally have no logging until they find out what to install.

Decision (maintainer, 2026-11-01)

Ship both handlers. They coexist since #555: only marko/log binds LoggerInterface, and handlers are chosen by name through log.handlers.

• Skeleton composer.json requires marko/log, marko/log-file and marko/log-stream.
• .env.example sets LOG_HANDLERS=file, which suits local development, with a comment: containers and PaaS use stream (stderr), and file,stream writes to both.
• Deploy docs get a short "Logging in production" section. stream suits containers and PaaS, whose platforms collect stdout/stderr. file suits servers you SSH into, and log-file rotates. Under RoadRunner, log-stream must target stderr.

Exit criteria

• Skeleton requires the three packages; .env.example has LOG_HANDLERS=file plus the comment
• Skeleton tests updated if they assert its dependencies
• Skeleton docs and the deploy/logging docs updated
• composer ci green