model.info and saved profiles report a user-defined provider as custom:<key>, but the catalog row uses the bare key as its slug. Settings > Model and the Bot Mode picker compared the two with ===, so a saved custom provider never found its row. Settings showed a duplicate custom:<key> entry and a Set up provider button, and the bot editor fell back to the manual form.
Both now match rows with catalogProviderMatches, like the composer picker already does. Settings uses a small findCatalogProvider helper for every row lookup, including the aux and MoA slots and the endpoint passed on Set to main. catalogProviderMatches is now exported through the plugin SDK so the bot picker can use it.
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