Upgrade dev-cmd to pick up improved -l output. (#28)

Now:
```console
:; uvrc -l
Commands:
fmt
check-fmt
lint
check-lint
type-check:
    -py: The Python version to type check in <major>.<minor> form; i.e.: 3.13.
         [default: {markers.python_version} (currently 3.12)]
test (-- extra pytest args ...)

Tasks:
checks (-- extra pytest args ...): 
    Runs all development checks, including auto-formatting code.
ci (-- extra pytest args ...): 
    Runs all checks used for CI.
```