EffectWitness v0.2.1

EffectWitness v0.2.1 is an evidence-bound prerelease of the agent/tool effect
workbench at source revision
e0e9ce9c8fc14ea15534905afd2b1e1b08cc5ac9.

This version carries the exact, version-pinned stdio integration introduced in
v0.2.0 for the official MCP filesystem server. Five registered inputs are each
called twice and bracketed by fail-closed S0/S1/S2 relative byte-tree
observations. The committed Windows reference includes normalized hashes,
bounded facts, JUnit, provenance, and a closed manifest. Tag CI independently
generates and verifies fresh Windows and Ubuntu observations.

v0.2.0's tag CI had one timing-sensitive Windows Python 3.12 transport
readiness failure, so no v0.2.0 Release was created and its tag remains
unchanged. v0.2.1 replaces the fixed wait in that test with a successful
transport-ready barrier while preserving the blind-retry and durable-effect
assertions.

The attached assets are only the Python wheel and source distribution. The
wheel contains no integration metadata or Node/npm payload. The source
distribution contains the exact lock and provenance metadata used to prepare
and verify the external dependency, but does not redistribute that dependency
or its runtime.

The observations are source-, version-, input-, and OS-bound. They do not
establish exactly-once execution, package-wide correctness, official MCP
conformance, security, performance, production reliability, independent
review, external use, or adoption.

Public tag CI:
https://github.com/tiramitree/effect-witness/actions/runs/30257552654