Generates a standard leaf command class for the Admiral command tree.

Every leaf command follows the same shape: a --config/-c flag, a required environment argument, and a run that loads the config, resolves the environment for the given target, builds a Task (wired to the injectable Squarectl.executor), and hands it to a Tasks::* method.

The three commands that deviate from this shape keep bespoke definitions: compose exec (omits -c so it passes through), kube convert (extra --output flag) and completion bash (no config/environment).

Parameters: name - the command class name (e.g. Up) description - the help text target - the squarectl target ("compose"/"swarm"/"kubernetes"), usually the enclosing command's SQUARECTL_TARGET constant task_call - the Tasks::* call to run, referencing task and arguments passthrough - whether undefined flags are forwarded through arguments.rest to the underlying binary instead of being rejected. Defaults to true because most leaf commands wrap docker/kompose/kubectl; pass passthrough: false on the ones that never read their arguments (info, configs, secrets, ...) so a typo there is still reported instead of silently ignored.

Note: in passthrough mode Admiral refuses to guess an unknown flag's arity, so the ENVIRONMENT argument must come before any forwarded flag (compose up staging --profile web, not the reverse).