Teknium 8f6ef042c1 fix(cli): buffer reasoning preview chunks and fix duplicate display (#3013) ...

Three improvements to reasoning/thinking display in the CLI:

1. Buffer tiny reasoning chunks: providers like DeepSeek stream reasoning
   one word at a time, producing a separate [thinking] line per token.
   Add a buffer that coalesces chunks and flushes at natural boundaries
   (newlines, sentence endings, terminal width).

2. Fix duplicate reasoning display: centralize callback selection into
   _current_reasoning_callback() — one place instead of 4 scattered
   inline ternaries. Prevents both the streaming box AND the preview
   callback from firing simultaneously.

3. Fix post-response reasoning box guard: change the check from
   'not self._stream_started' to 'not self._reasoning_stream_started'
   so the final reasoning box is only suppressed when reasoning was
   actually streamed live, not when any text was streamed.

Cherry-picked from PR #2781 by juanfradb.

2026-03-25 12:16:39 -07:00

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