Prerequisite for ConstructionSystem completing a building itself rather than
handing a finished site back: materialisation needs the buffer initialisers and
the BeltSystem registration, and both were BuildingSystem members.
initBuffers turned out to need nothing at all — it works purely on the Building
and RecipeDef it is given. The other three need only the config.
reregisterBeltTile takes BeltSystem and the config; it stays shared rather than
moving, because cancelDeconstruction and rotateInPlace use it too and are staying
on BuildingSystem.
Verified with a golden-checksum capture before and after — all four sample ticks
identical.
Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YHcUerKAZKWNvSKJxYKbnG
