Follows the renderer/system split documented in wiki/architecture/
renderers.md and systems.md: the renderer must not run geometry
generation. Mirrors the door-renderer/door-system pattern.
- New ShelfSystem reads dirtyNodes in useFrame, retrieves the shelf's
registered Group from sceneRegistry, swaps its children with the
output of buildShelfGeometry(node), then clears the dirty flag.
Geometry rebuild is fully imperative — no React work involved.
- ShelfRenderer is now a thin empty <group> that registers with
sceneRegistry, marks the node dirty on mount, and carries the
pointer-event handlers + live transform overrides at the root.
- Wired system into shelfDefinition so RegisteredSystems mounts it
alongside the renderer.
Net effect: dragging shelf parametric sliders no longer re-renders
the renderer per tick — the system rebuilds meshes at frame cadence
based on dirtyNodes, the inspector's per-field subscription only
re-renders the dragged field, and the rest of the React tree stays
quiet.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
