Fixes the two things the user saw in the Ships browser:
- "Can't find the thrusters": show_external defaulted OFF, hiding the engine
rig / bridge / turrets entirely. Externals are EXACT since the node-TRS fix,
so the toggle now defaults ON (relabelled; off = bare hull bodies).
- "Some parts very far away": families without a composite scene graph (fighter
morph sets like f002 whose detached parts are authored far from the origin,
shared turret/prop part families) fell into the stack-at-origin fallback and
rendered as piles with stray pieces. ShipModel now carries has_composite and
the catalog lists only real assembled ships.
Offline audit across ALL stages (ship_audit example): the only far-away
outliers were composite-less f002 morph parts (now filtered); every capital
ship assembles coherently (e108 places its 7 turret instances, f105 its
mirrored shield generators). All primary composites are single-key tracks —
multikey exists only in animation composites (e901 attacks, missile-open),
which assemble_ship does not select.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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