v2.6.9

Claude on Anthropic, AWS, and VertexAI used to silently drop an explicit 0 for temperature, top_p, or top_k, since a bare truthiness check treated 0.0 as unset and fell back to the API default near 1.0. Agno now checks is not None, so setting any of these to 0 produces the deterministic output you asked for instead of quietly reverting to a random one.