Create traces from RSpec tests using OpenTelemetry or your own tracing library

Sashiko is a small Ruby gem that adds a declarative span DSL on top of OpenTelemetry, plus helpers for keeping trace context attached as work crosses Thread, Fiber, queue, HTTP, and Ractor boundaries. Includes a span-replay mechanism for emitting spans from Ractor workers, optional Faraday and Anthropic adapters, RBS signatures, and a Ruby::Box-aware `tracer:` injection path for multi-tenant observability.

Shared library for asynchronous messaging, distributed tracing, and customizable adapters.

A traces backend for Open Telemetry.

A minimal dependency XLSX reading and writing library for Ruby, relying on standard libraries for core logic and opentelemetry-api for observability.