Add list command to print available commands

[TomasVotruba]

Restores the previous CLI behavior: bin/jack list works again (it was the smoke-test command in the anywherephp build before #39, but never actually existed in the entropy console).

• ListCommand prints the same overview as --help and exits 0
• registered explicitly in ContainerFactory with lazy HelpPrinter resolution, to avoid the circular dependency ListCommand → HelpPrinter → CommandRegistry → ListCommand
• covered by ListCommandTest (exit code + name; output assertions are not possible since OutputPrinter is silent under PHPUnit by design)
• build/target-repository/bare_run.yaml switched back from --help to php bin/jack list, so the anywherephp/jack smoke test exercises the command again

Also includes a small Rector auto-fix in BreakPointCommand (composer rector output: DateTimeImmutable import + simplified return).

$ php bin/jack list
Commands:
  list                   List available commands
  open-versions          Open composer.json version constraints to the very near next version
  breakpoint             Let your CI tell you, if there are too many major-version outdated packages
  raise-to-installed     Raise your version in "composer.json" to installed one to get the latest version available in any composer update

ECS ✅ Rector ✅ PHPStan ✅ PHPUnit ✅ (15 tests)