v0.2.1

Changelog

• 94622f7 feat(sessions): allow concurrent turns on one thread
• a09bd79 feat(sessions): replay history through ACP session/load
• caae151 feat(webui): improve session UX and streaming restore
• dc1673e fix(sessions): make explicit New session start a clean turn
• a1ee4e6 perf(session-history): cache replay snapshots