4d9ffcd3ca
The contextTimeline fold persisted `undefined`-valued properties (model/provider/lastModel/contextWindow at init, pendingShadowedSeqs set to undefined on consume, and turn/step written as undefined when absent from assistant/message data). The harness projection cache snapshots the whole session checkpoint through the lossless-JSON snapshotter, which rejects any `undefined` property — so every projection-cache write failed and the `title` projection (session list) degraded after restart. stateVersion 3→4 discards stale rows; a regression test now drives the real snapshotJsonValue. Fixes #5, #7. Co-authored-by: kiligzzz <kiligzzz@users.noreply.github.com> Co-authored-by: Bowen Liang <liang.bowen.123@qq.com>