tower-hs-0.1.0.0: CHANGELOG.md

# Changelog

## 0.1.0.0 — 2026-04-06

- Initial release
- Core `Service`/`Middleware` abstractions
- Middleware: Retry, Timeout, CircuitBreaker, Filter, Hedge, Logging, Tracing (OpenTelemetry), Validate, Transform, TestDouble
- `Tower.Error.Testing` module with shared `Eq ServiceError` instance