It's unclear if I can pass custom catalog items to my A2A server

_↴ Ported from [flutter/genui#785](https://github.com/flutter/genui/issues/785) — originally opened by [vovaklhdella](https://github.com/vovaklhdella) on 2026-03-06._
_Original labels: front-line-handled_

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**Is your feature request related to a problem? Please describe.**
I would like to see example of passing custom catalog items in the verdure app example.
I can see the next comment in the `a2ui_client_capabilities.data` - "/// `acceptsInlineCatalogs: true`. This is not yet implemented."
It's still unclear for me if I can pass custom catalog items to a custom A2A server. If yes - I suggest you can update docs.

**Describe the solution you'd like**
Add example of passing custom catalog items to a custom A2A server and update docs.

Revise el verdure app example y el archivo a2ui_client_capabilities.data mencionado en la issue. Encuentre dónde se gestionan los catalog items y compruebe si está implementado el paso de catálogos personalizados. Actualice la documentación con un ejemplo si es posible, o aclare la limitación actual.

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