Entity renderer now tracks relationship per entity and tweens D-033 tint color over 0.7s when relationship changes (e.g. on confrontation delivery). Uses manual lerp in _process() for testability instead of SceneTree tweens. Cursor hover tint cascades automatically via Constants.color_for_entity_kind(). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>