Zed has detailed DeltaDB, a version-control system that records every operation rather than every commit. Where git snapshots your work at the moments you choose to save, DeltaDB breaks editing into a stream of fine-grained deltas and gives each one a stable identity you can point to.
The consequence is that references stop being line numbers. Because a comment or link is anchored to a delta, it survives as the surrounding code moves, so you can jump from a line in an old conversation to that code as it stands now, or trace any line back to the conversation that produced it. DeltaDB also embeds conflict-free replicated worktrees, letting several people and agents edit the same files at once across machines, with the chat that drives the work stored beside the edits it produced.
Zed's framing is the sharp part: pull requests and review threads exist only to reattach a discussion to code after the two were separated. Keep them together and the ceremony disappears, with git and CI demoted to running checks.
A beta is due in a few weeks.