v0.2.1
Patch release that moves prepared statements and session message handling closer to explicit per-connection state without changing the public API.
Highlights:
- move prepared statements into the per-session state container
- thread session state explicitly through the backend read loop
- reduce disconnect cleanup to a single session-state teardown path
- keep async notice/notify routing and COPY side-message handling compatible
- preserve the existing public predicate signatures and local test coverage