Commands: duck type memoryReport

We should have a framework in place so that commands can easily estimate the amount of ram they require.

The framework can then warn if there is insufficient memory to run a given command.

Start by locating the command infrastructure and existing command implementations in the repository, then trace how commands are executed. Determine where memory requirements could be reported and where insufficient-memory warnings belong. Done means commands can estimate their RAM needs and the framework warns when available memory is insufficient.

Written by the indexing model from the issue text.