fs-test checks an unattended detached session expires its messages on its own

Round 7 saw messages linger for minutes in a detached session. With nothing
attached they do expire, on the session's own clock (nextWake schedules the
look, expireUnattended drops them); the merge did not regress it, and a
session driven only over 9P now has a test that it does, with no request in
between. With a frontend attached a message stays until its next key or
click, as config.md and detached.md say; the lingering the agent saw is that.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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