feat(suspend): detach the tmux client as the final step of every suspend

A suspend now ends by detaching the tmux client viewing the aiv-<project> session, so the parked session drops out of the alt-space rotation instead of cluttering it. Detach is not teardown: the session and agent process stay alive in the background and only the view disconnects, so it runs inline as the last action (the handoff text is preserved in the pane and shown on re-attach) rather than deferring to a Stop hook the way the session-killing teardown must. Degrades gracefully when not in tmux.

Originated in archsetup as a local stopgap and reconciled to canonical here.

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