Integration Guard System Coordinates Parallel AI Agents to Prevent Git Merge Conflicts

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A subsystem called Integration Guard has been implemented in Vibe Kanban Alternative, a self-hosted fork of Vibe Kanban, to safely manage multiple AI coding agents working in parallel Git worktrees. Each agent operates on its own isolated branch and filesystem, but problems arise when the shared target branch advances while an agent is still working. The system uses a database-backed lease to serialize merge operations, preventing two agents from simultaneously updating the target branch. Rather than forcing rebases, it computes a three-way merge using the original common ancestor, the current target head, and the agent branch head to combine changes cleanly. Beyond textual Git conflicts, the guard also flags semantic conflicts by checking declared dependencies, alerting developers when logically incompatible changes may have been introduced even across different files.

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