* test(#3737): use_worktrees=false opt-out must win in the dispatch-isolation sentinel * fix(#3737): fold the workflow.use_worktrees opt-out into the dispatch-isolation record * test(#3737): guard allows sequential dispatch under the opt-out sentinel * chore(#3737): changeset fragment (pr number backfilled after PR creation) * chore(#3737): backfill changeset PR number (3938) --------- Co-authored-by: sim <sim@local>