PR #2281 added table-format support to parsePiModels but kept the
unconditional `strings.Replace(":", "/", 1)`, which would silently
rewrite a `:` inside a model name read from column 1 of the table
output (e.g. `claude-sonnet-4-6:exp` would become
`claude-sonnet-4-6/exp`). Move the replace into the legacy
`provider:model` branch so only the colon-as-separator case is
normalized, and restore a short doc comment describing the dual-
format contract. Test extended with a colon-bearing table row.
Co-authored-by: multica-agent <github@multica.ai>
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