mohdel v0.104.1

Fixed

• Rust AnswerResult rejected cacheWriteInputTokens /
  cacheReadInputTokens under deny_unknown_fields. Both now
  declared as Option<u32>. Conformance fixtures added so future
  Rust↔JS schema drift fails in CI.

Changed

• Wire-shape docs are provider-neutral (no "Anthropic-style" /
  "OpenAI-shape" framing).