fix(listen): keep adhoc identities after a quiet listen timeout

A quiet adhoc `hcom listen` recorded `exit:timeout`, which falls in the
60s exit-cleanup tier that ignores process liveness. Adhoc rows carry no
PID, so any adhoc agent polling with listen lost its identity about a
minute after its first empty poll, as soon as anyone ran `hcom list`.

A timeout is not an observed exit. Record `listen timeout` (non-exit
inactive) in both listen modes, so quiet polls follow the ordinary
inactive tier like every other adhoc command. Real exits still record
`exit:*` and are still reaped on the short tier.

Filter-mode match/message also set adhoc to active, which nothing ever
resets for a hookless tool; it now records inactive like message mode.

Refs #118