Third Stage D affordance port (302 LoC legacy → action + thin wrapper).
The action (`actions/move.ts`) uses the live-drag exception documented
in editor/wiki/architecture/tools.md: visual-only updates via
`sceneRegistry.nodes.get(id).position` + `useLiveTransforms` during
the drag, no scene mutations. Avoids re-rebuilding the fence geometry
(many posts + infill panels) every pointer tick. Commit performs the
single-undo dance — writes final start/end to scene, geometry rebuilds
once, Ctrl-Z reverses the whole drag.
Linked-fence cascade follows the same shape as MoveFenceEndpoint —
any fence in the same parent that shared an endpoint at activation
moves with the drag.
`getRegistryAffordanceTool` extracted to
`tools/shared/affordance-dispatch.ts` so move-tool.tsx and
tool-manager.tsx share the lazy-load helper (no duplicate caches).
MoveTool dispatch gains a generic `affordanceTools.move` check after
the capability-driven `movable` shortcut — fence routes through here;
wall / slab / etc. fall through to their legacy per-kind chain until
their D ports land.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
