- Replace deprecated typing imports (Dict, Callable, Generic) with
collections.abc.Callable and built-in dict
- Convert Command from ABC to plain base class (B024: no abstract methods)
- Convert CommandHandler to PEP 695 type parameter syntax (UP046)
- Remove unused PlanService/ProjectService imports from command_registry
- Fix ruff format: blank line before nested defs in command_registry and steps
- Rename @then('a ValueError should be raised') to domain-specific suffix
to avoid AmbiguousStep collision with lsp_registry_steps.py
ISSUES CLOSED: #8880
Implemented a command bus architecture to decouple CLI command handling from application services. Added command_bus.py with Command, CommandHandler, and CommandBus classes, and command_registry.py to register handlers. Introduced BDD tests at features/cli_command_bus_decoupling.feature and corresponding step definitions in features/steps/cli_command_bus_steps.py to verify the decoupling behavior.
ISSUES CLOSED: #8880
HAL9000