fix: a roster with no active lanes must not exit 0

[CryptoJones]

Closes #26.

==========================================================================
0/0 lanes answered in 0.0s
$ echo $?
0

len(answered) == len(results) is true of two empty lists, so a config with
every lane parked reported a clean run having asked nobody anything.

That's the same shape as partial delivery, which this tool deliberately treats
as failure — a lane that silently did not run. And in a cron or CI context the
exit code is the only signal anyone reads, so the one case that should shout was
the one case that was quiet.

Now:

roundtable: <config> has lanes, but none are active — set active: true on at least one
exit=1

--list stays exit 0 with an empty roster — "what is configured" is a fair
question even when the answer is none.

Tests

62, up from 60. Two new: the run fails and names the cause, and --list still
succeeds on the same config.

CI

GitHub Actions still in major outage. Local equivalent:
LOCAL CI EQUIVALENT: PASS. Holding the merge.

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