v0.3.0

Added

• images: option for image inputs with provider: :openai and provider: :cloudflare.
  Images are base64 data URLs; SystemOneClient.image_data_url/2 builds one from bytes.
  OpenAI receives them as input_image parts before the state text; Clef receives its
  top-level images array. Both see the images before the state.
• SystemOneClient.Images validates images before any request: data URLs only (no remote
  URLs), plus Clef's limits of 4 PNG, JPEG or WebP images, 4 MiB each and 8 MiB in total.
  Other providers return {:error, {:unsupported_option, :images, provider}}.
• Telemetry metadata includes image_count.

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• Hex: https://hex.pm/packages/system_one_client/0.3.0
• Docs: https://hexdocs.pm/system_one_client/0.3.0
• Full changelog: https://hexdocs.pm/system_one_client/changelog.html