mohdel v1.2.0

Added

• embed() beside answer() and transcribe():
  mo.use('openai/text-embedding-3-small').embed(['a', 'b']) returns
  { vectors, dimensions, inputType, inputTokens, cost, timestamps }, one
  vector per input in request order. OpenAI, Gemini, Cohere and local;
  callEmbedding from mohdel/client for the gate's POST /v1/embed.
• Catalog fields embeddingPrice, dimensions, dimensionsSelectable,
  maxBatch, maxInputTokens, inputTypes and defaultInputType.
  inputTypes maps a symbolic role (query, document, …) to the
  provider's vocabulary; an entry declaring none rejects inputType rather
  than dropping it. A batch over maxBatch fails before dispatch.
• Cohere, for embeddings only. It has no chat models.

Fixed

• A catalog field declared boolean always failed validation; schema.js
  had no checker for the type.
• cost rounds to ten decimals rather than six, which reported a short
  embedding as 0.