Foreign agent worktrees parked under this repo's .omx path were making VS Code show branches under the wrong repository. The prune flow now detects mismatched git common-dir ownership and moves those worktrees into the owning repo's .omx/agent-worktrees directory before normal cleanup logic runs. Added regression coverage for rerouting behavior.

Constraint: Must preserve existing cleanup semantics for merged/unmerged local agent branches

Rejected: Deleting foreign worktrees automatically | could destroy active work in another repo

Confidence: high

Scope-risk: narrow

Directive: Keep foreign routing in prune/cleanup path so cross-repo worktree bleed is corrected without a separate command

Tested: node --check bin/multiagent-safety.js; bash -n scripts/agent-worktree-prune.sh templates/scripts/agent-worktree-prune.sh; npm test

Not-tested: Manual VS Code UI verification after cleanup across multiple concurrently open repos