The idle _reached.Clear() at the end of Execute is deleted: Ping() is the one per-ping reset
(ASecondPingCrossesTheSameShipAgain). A sweeping tick drops reached subjects that left the zone,
and a ping ends when its pinger is in another zone than it began in. New tests: the ending step's
band, every return credited, an inactive ally posted none, Deactivate clearing the inbox, a ping
ending on a zone change, and a leave-and-return subject crossed again.
Not yet verified: no verify job has run on this commit.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
d2709d550e