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When the last linked worktree is removed (either via /exit from a worktree or when an agent worktree is cleaned up), Claude Code now checks whether extensions.worktreeConfig was enabled by Claude and restores the git config to its pre-worktree state automatically.
Evidence
Worktree config cleanup (search for "Restored extensions.worktreeConfig in" and "enabledWorktreeConfigExtension")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.