AsteroidBelt.Extent(data, rail) is now static over the belt's data and the only spelling: the clearance tree's
'Distance + BeltHalfWidth' and the instance Extent are gone. The swarm host filter loses its dead '!p.Empty'
(no bodyless node has a parent). Findings extent-second-spelling and dead-empty-guard (trojan-swarms-residuals).
The clearance tree now reads the outermost rock, not the rail plus half-width, so 29 of the 1920 zones of seeds
1-30 place a station or turret differently. TrojanSwarmTests.BaseDigest is repinned for seeds 3-6, which hold such
zones; seeds 1 and 2 are unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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