Writes append resolved deltas with optimistic concurrency and self-heal lagging projections. Reads hit projections only. Index-backed find is property-tested against unindexed find. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017Qxbkp4tA7G5SCWjzWuxmE