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Sending an image put a bare `claude · message:user:content:image` row between the user's bubble and the answer. Two causes, and only the second is a family. An image part counted as modelled only when `source.type === 'url'`, but claudeDispatchMessageContent sends a local attachment as a base64 source and the CLI replays that shape back, so every attached image was classified unmodelled. Accept the base64 and file sources Orca itself sends. The family is the real defect. `message:<role>:content:<type>` kinds are synthesised at runtime from whatever `part.type` arrives, so unlike the top-level frame catalogue they can never be enumerated ahead of time -- the `?? 'timeline-substantive'` default then prints the synthesised name at a user who cannot act on it. That default is right for top-level frames, where "substantive" means show the frame; here it meant show our own vocabulary, which drops the content AND leaks the opcode. So an unrenderable part now renders a sentence saying exactly that, with the kind and payload still on the row's disclosure. A part that carries its own readable sentence keeps it -- the placeholder is a fallback, not an override. An unknown future part type is therefore visible, never silently dropped and never printed as a kind: the same principle as the effort readback, which records only what the provider confirms.