When some models (e.g. kimi-k2.5) put user-facing replies into
reasoning_content/thinking blocks without generating text content,
downstream clients receive empty responses. This adds a new
promoteThinkingOnEmpty option that promotes reasoning content to
text content when the response has no text block.
Also adds hiclawMode as a convenience flag that enables both
mergeConsecutiveMessages and promoteThinkingOnEmpty for multi-agent
collaboration scenarios.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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