How to check and fix namespace / filename / PSR-4 mistakes

Makefile

# Parameters (optional)
# * `arg`: arbitrary arguments to pass to rules (default: none)
# * `env`: used to set APP_ENV (default: test)
arg ?=
env ?= test

# Docker containers
PHP_SERVICE = app

# Executables, from the container
# FAST: disable "slow" XDebug when not needed
# FASTER: use local executable when the container is not needed
PHP             = docker compose exec $(PHP_SERVICE) php
PHP_FAST        = $(PHP) -dxdebug.mode=off
PHP_FASTER      = php -d memory_limit=1G
COMPOSER        = docker compose exec $(PHP_SERVICE) composer
COMPOSER_FASTER = composer
CONSOLE         = $(PHP) bin/console
PHPUNIT         = $(PHP) bin/phpunit
PHP_CS_FIXER    = $(PHP_FASTER) bin/php-cs-fixer
PHPSTAN         = $(PHP_FASTER) bin/phpstan
SWISS_KNIFE     = $(PHP_FASTER) bin/swiss-knife

test: ## Runs tests using PHPUnit (arg, eg `arg='--testdox --filter Controller'`)
	@$(PHPUNIT) $(arg)

cs-check: ## Checks CS with PHP CS Fixer (arg, eg `arg='./src'`)
	@$(PHP_CS_FIXER) check --verbose $(arg)

swiss-knife: ## Runs Swiss Knife (arg, eg `arg='namespace-to-psr-4 src --namespace-root "App\\\\"'`)
	@$(SWISS_KNIFE) $(arg)

php-cs-fixer: ## Coding Standards with PHP CS Fixer (arg, eg `arg='fix ./src/'`)
	@$(PHP_CS_FIXER) $(arg)

phpstan: ## Static Analysis with phpstan (arg, eg `arg='analyze ./src/'`)
	@$(PHPSTAN) $(arg)

static-analysis: ## phpstan + psalm
	@$(MAKE) phpstan
	@$(MAKE) psalm

qa: ## cs-check + static-analysis + test
	@$(COMPOSER_FASTER) dump-autoload --optimize --strict-psr --strict-ambiguous
	@$(MAKE) cs-check
	@$(MAKE) static-analysis
	@$(MAKE) test

cs-fix: ## Fixes CS with PHP CS Fixer and PSR-4 namespaces (arg, eg `arg='./src'`)
	@$(SWISS_KNIFE) namespace-to-psr-4 src --namespace-root 'App\\'
	@$(SWISS_KNIFE) namespace-to-psr-4 tests --namespace-root 'Tests\\'
	@$(PHP_CS_FIXER) fix --verbose $(arg)