terminal commands are silent when tmux runs them

tmux shows a hook's output and a non-zero exit in view mode over the pane.
the focus hook's normal outcomes (focus moved on, Ghostty not in front)
exited 1, and the one-second settling made "focus moved on" common:
"'dingger terminal focused --client ...' returned 1" kept covering panes.
`dingger terminal focused` and `terminal raise` now always exit 0 and
print nothing unless run by hand.

tmux::client_format checks that tmux answered for the client asked about:
for a client that is gone, tmux answers for the current one, so a raise
for a client that had just detached raised another client's terminal.

e2e step 20: no pane in view mode after the hook's failures, a gone
client raises nothing, and a focus held past the settling second; the old
code fails the new checks.

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