Gate found the plugin-routing branch ran AFTER the provider==config_provider
early-return, so when an ACTIVE plugin provider was also the configured default,
model_with_provider_context returned a bare model and dropped the '@plugin:'
hint -> wrong backend. Moved the _is_plugin_model_provider() branch above the
config_provider passthrough. Regression test (GMI + anthropic/claude-sonnet-4.6
as the active plugin+configured provider) added. Co-authored-by: alexfoxtm.
Salvaged from #5461 by @alexfoxtm — the catalog-surfacing half was correct; this rebuilds it fresh on master and adds the missing routing (model_with_provider_context -> @plugin:model) + a routing regression test.
Co-authored-by: alexfoxtm <alexfoxtm@users.noreply.github.com>
nesquena-hermes