[dermatthes]

Summary

• remove ob_start() / ob_get_clean() / ob_end_clean() from CliApplication::run()
• write command output directly instead of returning captured output
• adapt CliDispatcher, documentation and example usage
• add PHPSpec regression coverage that verifies the action executes at the caller's existing output-buffer level

Rationale

CliApplication introduced output buffering on 2026-09-27 to make the existing echo-based dispatcher output available as a return string. That global buffering side effect is undesirable for an embeddable CLI library; output ownership remains with the caller.

Compatibility

This intentionally changes CliApplication::run() from string to void. Exceptions still propagate unchanged.