- `mcpctl logs <server-name>` resolves to first RUNNING instance
- `mcpctl logs <server-name> -i <N>` selects specific replica
- Shows "instance N/M" hint when server has multiple replicas
- Added 5 proper tests: server name resolution, RUNNING preference,
replica selection, out-of-range error, no instances error
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>