Make 'dlm metrics' a subcommand group (M13.3)#14
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Summary
Audit 13 M13.3: `dlm metrics PATH --run-id 1` errored with
"Missing argument 'PATH'" because click's group dispatch couldn't
disambiguate a positional-then-option from a subcommand-then-args
when the group had both a callback positional AND a registered
`watch` subcommand. `dlm metrics --run-id 1 PATH` (option before
positional) was the audit's workaround.
The fix makes `show` an explicit subcommand alongside `watch`. The
ambiguity goes away. Both arg orders now parse cleanly.
Breaking change: `dlm metrics PATH` becomes `dlm metrics show
PATH`. `dlm metrics watch PATH` is unchanged. CHANGELOG entry +
docs/cookbook + README updated.
Test plan