test(mirror): command-level test for `repo mirror list --show-available`
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Add a test seam (activeCoreClient) so repo mirror list can run end-to-end
against an httptest core, and lock in the --show-available routing: endpoint
selection, columns, banner, and --owner/--cluster/--provider flag behavior.
Also correct the availableMirror column doc to use full command names.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: f4db3e97fed1
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