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download_media_to_file's non-transport errors all folded into PixivError::Api, and Api is permanent in pixiv_error_is_retryable — so one 429/5xx, stalled transfer or temp-file write failure while fetching the ugoira frame zip permanently failed the whole post, while the bot's own upload downloads classify the very same classes as retryable (classify_download_error). A new PixivError::Transient carries those classes into the existing retry policy (and into startup validation's 'stays enabled' branch); Http keeps its arm and everything else stays permanent. The retryable table and the startup-validation loop pin both halves.