jev-0.1.0.0: CHANGELOG.md

# Changelog

## 0.1.0.0

- Enforce `timeoutMicros` across the complete HTTP operation, including reading
  the response body. Validation and JSON decoding remain outside the deadline.
- Add structured transport failures. `TransportError Text` becomes
  `TransportError TransportFailure`; total deadline expiry is `DeadlineExceeded`.
- Change `HttpError Int body` to `HttpError ResponseMetadata body`. Read the
  status from `metadata.statusCode`; headers and request IDs are retained.
- Add `ResponseDecodeError ResponseMetadata Text` for HTTP decoding failures.
  `DecodeError Text` is used by the pure fixture decoder.
- Reject contradictory distributions and scores using documented rounding
  tolerances, and require legends to cover returned probability indices.
- Add pure question validation, request inspection, and fixture decoding.
- Add optional OpenRouter routing and observability settings through
  `decideWith`, `decideJSONWith`, and `prepareRequestWith`.
- Add `Functor` instances for value-carrying public data types.
- Document public API contracts and consumer installation; add package bounds,
  license text, and isolated source-distribution verification.
- Move Nix tooling overrides to `cabal.project.nix`; ordinary Cabal builds now
  use a minimal project file.