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Cian Johnston
7cf6a4d304
fix(coderd/x/chatd): inline text attachments that providers would drop Text-family file attachments (e.g. application/json) sent to providers that reject them as file parts were silently dropped with a CallWarning the user never saw. Convert them to TextPart at prompt build when the target provider would drop that media type, so the model sees the content while the stored file part (chip, download, history) is unchanged. Provider acceptance is keyed on model.Provider() (the fantasy transport identity) to correctly handle aibridge routing remapping. OpenAI distinguishes Responses vs Chat Completions via IsResponsesModel. Only text/plain, text/markdown, text/csv, and application/json are ever decoded; binary content is never touched. Inlined content is sent in full with no truncation, matching how a provider that accepts the media type natively would receive the file.