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Migrate actions from flags to subcommands and fix quiet-mode output for multiple files

Migrate actions from flags to subcommands and fix quiet-mode output for multiple files: a task in LegoFlow-SWE (Harbor dataset). The dotenv-linter CLI currently exposes fix and listing actions via --fix / -f and --show-checks flags. These should be proper subcommands, and the default action (lint)…

The task

The dotenv-linter CLI currently exposes fix and listing actions via `--fix` / `-f` and `--show-checks` flags. These should be proper subcommands, and the default action (lint) should be available as `check` (or as the default when no subcommand is given). Additionally, quiet mode (`--quiet`) has a bug: when multiple…

Part of Lego-X/LegoFlow-SWE.