feat: multi-user editing safety

[Cristhianzl]

Today nothing protects a flow from being edited by two people at once. Every save rewrites the whole graph, so whoever saves last silently wins and the other person's work is gone — no warning, no conflict, no way to tell it happened.

This pull request covers the work to close that gap: make it safe for more than one person to work on the same flow, and make sure nobody loses work they cannot get back.

Work in progress. It lands in stages, and the scope will keep evolving as we build — this description will be updated as it settles.

[coderabbitai]

Important

Draft PR not reviewed

Draft PRs are not automatically reviewed by default.

• Trigger a manual review

To automatically review draft PRs, update your CodeRabbit configuration:

reviews:
  auto_review:
    drafts: true

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[github-actions]

Build successful! ✅
Deploying docs draft.
Deploy successful! View draft