* Renamed `call_once` to `invoke` (now using the new `_execute_command`). * Integrated `_EXECUTED_COMMANDS` with `_execute_commands` (via `_execute_command`) to support not repeating manually invoked commands when using the new `invoke` operator. * Integrated decorator utilities with the register and help system.
* Renamed `call_once` to `invoke` (now using the new `_execute_command`).
* Integrated `_EXECUTED_COMMANDS` with `_execute_commands` (via `_execute_command`) to support not repeating manually invoked commands when using the new `invoke` operator.
* Integrated decorator utilities with the register and help system.

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