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1b10ea391a
DeepSeek v4 in thinking mode sometimes returns reasoning_content: "" when the model answers directly without internal reasoning. Two places were filtering the empty string out, which dropped the thinking block from the assistant turn entirely. The next request then omitted reasoning_content for that prior turn, and DeepSeek rejected with 400 "reasoning_content ... must be passed back to the API". Fix: - openaiStreamAdapter: open a thinking block whenever reasoning_content is present (including ""); skip the empty thinking_delta event since the empty value is already conveyed by the block's initial state. - openaiConvertMessages: preserve empty thinking blocks as reasoning_content: "" when serializing assistant messages back to the OpenAI/DeepSeek format. Tests: - New: empty reasoning_content opens a thinking block (adapter). - Updated: empty thinking blocks now round-trip as reasoning_content: "" instead of being dropped. - New: assistant messages with no thinking block still omit reasoning_content (regression guard for non-thinking models).