Windsurf Adds Arena Mode and Git Worktree Multi-Agent Sessions — Side-by-Side Model Comparison With Parallel Isolation

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Windsurf shipped Arena Mode for side-by-side model comparison, Plan Mode for structured pre-execution review, and parallel multi-agent sessions backed by Git worktrees — giving each agent an isolated branch to work on simultaneously. The Git worktree approach for agent isolation is architecturally significant: it lets multiple agents work on the same codebase in parallel without conflicts, then merge when done. This positions Windsurf directly against Superset IDE for developers running agent swarms on a single codebase.