v0.12.0

Added

• Embedding models are priced. text-embedding-3-small ($0.02 / 1M input), text-embedding-3-large ($0.13) and
  text-embedding-ada-002 ($0.10) for OpenAI, gemini-embedding-2 ($0.20 text; image, audio and video input in ModalityPrices;
  Batch half price) for Google. They are ModelType.Embedding rows: GetByType(ModelType.Embedding) lists them and
  CalculateCost(inputTokens, 0) prices them.

Changed

• Exact lookup finds the vendors' undated Claude aliases. FindModelMatch("claude-sonnet-4-5", AliasMatchType.Exact) (and
  claude-haiku-4-5, claude-opus-4-5) returned null and reached its row only through the Contains pass; claude-3-5-sonnet-latest,
  claude-3-5-haiku-latest and claude-3-opus-latest are exact too. A test now requires every dated exact alias's undated name to
  resolve exactly to the same row.
• Breaking — the Claude 4.5 rows' ModelId is the vendor's name: claude-sonnet-4-5, claude-haiku-4-5, claude-opus-4-5 (were
  claude-4-5-sonnet, claude-4-5-haiku, claude-4-5-opus). Looking up the former ids still resolves exactly; code that compares
  ModelInfo.ModelId with them must use the new names.
• The nuget.org «Release Notes» of every package link to the GitHub release of its version, whose notes are this CHANGELOG's section for that version.