## What changed
- Add a harness that runs the Codex executable against a pinned official MCP
client conformance suite across shipping, intermediate, and modern protocol
versions, HTTP and stdio transports, and OAuth scenarios.
- Add a separate app-server regression matrix for transport, security, schema,
pagination, SSE, multi-round request, and catalog-boundary behavior.
- Check both suites against committed baselines so previously passing or
required checks cannot disappear or newly fail, while keeping known failures
visible in complete reports.
- Run the fixture self-tests and both executable-level gates from the Python
and TypeScript SDK test workflows.
## Testing
- Add unit tests for the fixture server, official-suite adapter, conformance
runner, baseline comparison, and reviewer regression runner.
GitOrigin-RevId: de59f039294e34ed72873d9f6940b52e89172c0d
