World Engine 0.1.2

• Fix issue #3: rope attachments no longer abort the game or dedicated server when their target body is missing from the rope scene.
• Materialize dormant rope targets and move unbound ropes into their local scene, preserving body precision, existing constraints, rope velocities, and world-space ground anchors.
• Keep unavailable attachments pending and retry them when the body and center of mass become available; tolerate removed targets, stale joints, missing ropes, and empty endpoints.
• Resume sleeping rope scenes after length changes, point edits, attachment changes, explicit wake-up, rope creation, removal, and scene transfers.
• Reclaim an empty former scene after its last rope transfers elsewhere, while retaining scenes with remaining ropes and preserving the 200-tick grace period.
• Add eleven native regression tests and seven dedicated-server game tests for missing, unregistered, dormant, and constrained rope targets, including scene transfer, connected rope scene merges, scene lifetime after target removal, disposal after the last rope transfer, sleep-then-modify behavior, and world-border rebasing. CI runs against freshly built natives, and release builds rebuild all six native targets.