0.4.1

Fixed

• Gemini tool calls no longer fail on the second step (#7).
  Gemini 3 models attach a thought signature to each tool call and reject the
  next request if it is missing. OpenSidekick now keeps that data and sends it
  back with the turn it came from, both on Google's OpenAI-compatible endpoint
  (extra_content) and through OpenRouter (reasoning_details). It goes only
  to the server that sent it.