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tmux target syntax accepts an unambiguous PREFIX, so both the socket discovery loop and the sender's -t could match X-old for target X. Discovery now probes has-session -t =NAME; the sender target gets '=' prepended unless it is already exact or compound (session:win.pane). Arm A3 proves it: a prefix-named session no longer swallows a delivery aimed at the shorter name (sender fails target-not-found rc 1).